The worldly comforts are not for me. I am like a traveler, who takes rest under a tree in the shade and then goes on his way. — Muhammad Copy Share Image
Often when works at a hard question, nothing good is accomplished at the first attack. Then one takes a rest, long or short, and sits down anew to the work. During the first half-hour, as before, nothing is found, and… — Henri Poincare Copy Share Image
