I already know that.
This is one of the most damaging sentences you can utter. Most people have said it — including myself — at one point or another. It’s easy to dismiss this as harmless, even confident. After all, if we already know something, aren’t we ahead of the game? In reality, these four words are a trap. They convince us that knowledge alone is enough. But here’s the truth: nothing changes until we take action.
When I think back to walking Te Araroa in New Zealand, I realise I used those words even then. They were dotted throughout my planning, creeping into my mind like a quiet whisper: I already know that. They existed when I started the trail. They even lingered while I walked, embedded in my daily routines and thoughts, subtly sabotaging my experience.
Planning That Shapes Your Journey
Before setting out on the 3,000 km trail, I made a multitude of decisions that shaped my journey — decisions that would impact my comfort, endurance, and mental wellbeing. One such decision was a seemingly small choice: what I would wear every day. I could pack only one outfit to serve as my walking wardrobe — one t-shirt, one pair of shorts, plus extra layers for colder days.
When it came to choosing my shirt, I was more concerned with budget than quality. I rationalised that any shirt would do — after all, I already knew I’d be wearing it every day, I already knew laundry opportunities would be limited, and I already knew that cotton was a terrible choice for outdoor adventure. “Cotton is rotten,” they say — for good reason. But despite knowing all of this, I chose a basic cotton shirt on sale.
I already knew it would cause problems. I already knew it would cling uncomfortably, trap sweat, and turn stiff and unpleasant. I already knew it would impact my enjoyment of the trail. And yet, I let the words I already know that keep me from taking action.
The Reality on the Trail
It didn’t take long for the consequences of that choice to become clear. The shirt soaked with sweat, retaining moisture and creating a breeding ground for bacteria. The stench was immediate and relentless. On hot days, it made me feel hotter; on cold days, it offered no warmth at all. After weeks of walking, the fabric stiffened, turning into something I can only describe as cardboard. I could hang it to dry, but it would remain rigid until soaked again — only then would it soften enough to wear.
Beyond the physical discomfort, the shirt began to affect my mindset. Each day, it was a small, constant reminder that knowledge alone wasn’t enough. I had previous experience — prior to Te Araroa, I had walked 1,000 km across British Columbia, Canada. I had made the same mistake there: choosing cotton over performance fabrics, paying for it every day. I knew better. And yet, I didn’t act differently. Why? Because I was locked into the idea that I already knew. And because of that, I felt I could do things my own way anyway.
It took hitting the limits of my comfort before I was willing to act differently — before I was willing to let go of what I thought I already knew.
Breaking the ‘I Already Know That’ Habit
It wasn’t until three months into the trail that I finally let go of that t-shirt. In Wellington, I invested in a merino shirt — soft, breathable, moisture-wicking, temperature-regulating, odour-reducing. Everything I had wanted from the start. The difference was transformative. Comfort increased tenfold. My mental focus improved. I was no longer walking in an extensive cloud of stench. By acting on what I knew, I not only improved my physical experience but also reclaimed my mindset for the trail ahead.
This moment taught me a lesson that goes far beyond clothing. Knowledge is only powerful when paired with action. We can carry extensive information about health, relationships, finance, career, or personal growth, but if we don’t act on it, it serves little purpose.
The Cost of “I Already Know That”
Think about your own goals. How many times have you dismissed advice, avoided a new habit, or delayed action because you felt confident in your knowledge? Maybe you know that eating healthy, exercising, and drinking enough water will improve your wellbeing — but are you actually doing it? Maybe you know that keeping a budget, tracking spending, and saving consistently will help your finances — but are you acting on it?
We tell ourselves we already know, and in that moment, it feels like progress. But in reality, saying I already know that often signals avoidance. It is a shield against discomfort, a way of keeping ourselves small. The problem isn’t the knowledge — it’s the failure to implement it.
This pattern isn’t limited to me or to the trail — it’s something I see everywhere, in life and work.
Walking the Talk
Since Te Araroa, I’ve noticed the same pattern over and over again. People who learn extensively about health, nutrition, and fitness choices still struggle when they don’t translate knowledge into action. Conversely, those willing to experiment, try new methods, and adjust their choices — even when it felt uncomfortable — are always the ones who thrive.
Stubbornness often disguises itself as confidence. We like to believe that knowledge alone is enough, that experience will carry us. But life, like Te Araroa, has a way of humbling even the most confident among us. Every blister, every stiff fibre, every small discomfort reminded me that doing is more important than knowing.
Turning Knowledge Into Action
Breaking the habit of saying I already know that starts with self-reflection. Ask yourself:
- Am I truly acting on what I know, or am I letting comfort and familiarity prevent progress?
- Are there small, deliberate actions I can take today to turn knowledge into results?
- What patterns am I repeating because I refuse to take the necessary step forward?
Growth doesn’t happen by accident. Achieving goals — whether in health, relationships, career, or personal development — requires stepping into discomfort and taking consistent action. Knowledge is only valuable when applied.
A Call to Action
Here’s what I’ve learned: start small. Pick one thing you already know you should be doing and do it today. If it’s improving your health, take a walk or prep a healthy meal. If it’s advancing your career, write the email or complete the task you’ve been putting off. If it’s improving your relationships, reach out or listen deeply.
The key is not to dismiss your knowledge but to leverage it. Stop hiding behind I already know that and start asking yourself: Am I really living what I know? Am I putting it into practice?
When we act on our knowledge, we move from theory to growth. We transform intention into experience. We stop merely walking through life and start stepping forward intentionally, every day.
Final Thoughts
I already knew the lessons I was learning on Te Araroa before I even set foot on the trail. And yet, it wasn’t until I changed my actions that I truly benefited from that knowledge. Life works the same way. Knowledge without action is comfort disguised as progress. Real growth comes from doing — from trying, failing, adjusting, and trying again.
So today, put on your merino shirt — metaphorically speaking. Let go of I already know that, act on what you know, and step into real growth.
