Many situations come uninvited and teach us lessons unknown before.
Education is a systematic process and has a certain territory but learning is unsystematic and has no certain territory.
Nature teaches much more than a teacher but we hear the teacher better than the nature.
Struggle in life brings worries and the worries are the source of unhappiness. So take it easy.
A drowning man tries to float but a drowned man floats automatically. The first one tries to be saved but the second one for his identification.