1. The Idea
Most things fail due to a lack of commitment and a lack of belief that they can work. Difficulty is rarely what kills them.
2. Related Quote
“It is not because things are difficult that we do not dare; it is because we do not dare that they are difficult.”
Seneca
3. Why This Matters to You
Think of the paper you shelved after one rejection, or the grant idea you dropped because it felt too ambitious. If this thought is right, those failures came from your own wavering, and the problem itself had little to do with it. That changes how you choose projects. You should start fewer of them and stay with each one through the second and third rejection. Your students notice this too, because a supervisor who believes in a thesis gives the student a reason to keep going.
4. Counter Viewpoint
Commitment can also trap you. Academia is full of people who spent years on a project that the evidence had already ruled out, held there by belief and sunk cost. Some problems really are too hard for the time, money or methods you have, and a good researcher learns to see that early. Knowing when to persist and when to quit is a skill in itself, and from the inside both choices feel like doubt.