He argued that when the truth is not known, we desire to know it, but once we do know it, there are not a few cases in which we repent our knowing and envy that earlier time when we lived blissfully ignorant.

With the troubled eyes of a youth
I envied
Birds flying—
Flying they sang.

It is doubly chimerical to build peace on economic foundations which, in turn, rest on the systematic cultivation of greed and envy, the very forces which drive men into conflict.

I am so happy, I cannot be contained in the world;
But like a spirit, I am hidden from the eyes of the world.
If the foot of the trees were not tied to earth, they would be pursuing me;
For I have blossomed so much, I am the envy of the gardens.