The mind, in short, works on the data it receives very much as the sculptor works on his block of stone.

Success or failure depends more upon attitude than upon capacity.

If any organism fails to fulfill its potentialities, it becomes sick.

I don't sing because I'm happy; I'm happy because I sing.

A thing is important if anyone think it important.

We are doomed to cling to a life even while we find it unendurable.

Evil is a disease; and worry over disease is itself an additional form of disease, which only adds to the original complaint.