Every psychological event depends upon the state of the person and at the same time on the environment, although their relative importance is different in different cases
No research without action, no action without research.
Learning is more effective when it is an active rather than a passive process.
Social action, just like physical action, is steered by perception.
Experience alone does not create knowledge.
A successful individual typically sets his next goal somewhat, but not too much, above his last achievement.