A bow and few arrows
It's easy to sit on the side and give other people advice that they should try more and harder. Normally, what works for one person doesn't necessarily work for another, which is why such advice shouldn't be taken lightly. Being in a position to give advice is in itself very different from working to get there. Would you accept unconditionally advice from someone that isn't in your position, just because he has the resources to be louder than anyone else? How many people stay at the back of this person? Can you afford to hire that much?
We all can try, but not infinitely so. And this is what is often forgotten by the people who accuse others of not daring more. Having a bow is not enough, especially when only few arrows are left and their relative value reaches our imaginary limit. We might not know for what to use them, our hands might shake too much when we stretch the string... So the only thing that we can afford is to eventually fail in a very controlled (and limiting) way. We can sharpen the arrow countless hours, we can improve its aerodynamics, we can test with bare hands if it can break through certain objects, but we can't improve over the fact that by shooting we might eventually lose it, break it, hit the wrong target or the same one (which is the dead end of our previous arrow). It becomes more rational to shoot with less force in a way that we can take our arrow back and reuse it multiple times, experimenting with different trajectories and wind conditions. Unfortunately we can't take our energy or time back. And they can force us to become emotional instead of rational. When emotion sets in, it takes our bow away. Now shoot.