Of what is significant in one’s own existence one is hardly aware, and it certainly should not bother the other fellow. What does a fish know about the water in which he swims all his life?
out Of My Later Years: The Scientist, Philosopher, And Man Portrayed Through His Own Wordsby albert Einstein
The value of a man, however, should be seen in what he gives and not in what he is able to receive.
It is not difficult to understand why the general principle of relativity (on the basis of the equivalence principle) has led to a theory of gravitation.