In one's life for putting forward the first step mother is the very first teacher, father is the second, the teacher is the third & a friend is the most important teacher for the construction of an improved & better life.
(as the most of the time is spend with a friend a good friendship gives us the good teaching as if the nectar but the bad we get is as poison in the construction of life.)
Interpretation is the evidence of growth and knowledge, the latter through sorrow that great teacher.
(Eleonora Duse (1858-1924), Italian actor. As quoted in Actors on Acting, rev. ed., part 11, by Toby Cole and Helen Krich (1970).
The great stage actor had an omnipresent aura of sadness and was reticent and retiring.)