“Knowledge of what is does not open the door directly to what should be.”

“A man should look for what is, and not for what he thinks should be.”

“As our circle of knowledge expands, so does the circumference of darkness surrounding it.”

“The value of a man should be seen in what he gives and not in what he is able to receive.”

“A table, a chair, a bowl of fruit and a violin; what else does a man need to be happy?”

“The further the spiritual evolution of mankind advances, the more certain it seems to me that the path to genuine religiosity does not lie through the fear of life, and the fear of death, and blind faith, but through striving after rational knowledge. ”

“One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one’s greatest efforts.”