The cardinal responsibility of leadership is to identify the dominant contradiction at each point of the historical process and to work out a central line to resolve it.
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.
In general, any form of exercise, if pursued continuously, will help train us in perseverance. Long-distance running is particularly good training in perseverance.
