"We carry faithfully what one gives us to bear, on hard shoulders and over rough mountains. And should we sweat, we are told “Yes, life is a grave burden.” But man is only a grave burden to himself! That is because he carries on his shoulders too much that is alien to him. ... Especially the strong, reverent spirit that would bear much: he loads too many alien grave words and values on himself."
January 1, 1970
https://en.wikiquote.org/wiki/Value_(ethics)