In general, any form of exercise, if pursued continuously, will help train us in perseverance. Long-distance running is particularly good training in perseverance.
Investigation may be likened to the long months of pregnancy, and solving a problem to the day of birth. To investigate a problem is, indeed, to solve it.
We think too small, like the frog at the bottom of the well. He thinks the sky is only as big as the top of the well. If he surfaced, he would have an entirely different view.
