لقد قال فولتير إذا كنت ترغب في التحدث معي عرّف ما تقول وحدد قولك. كم من نقاش قد ينكمش ويتحول إلى مقطع لو تجرأ المتناقشون على تحديد عباراتهم وجملهم، هذ… - Will Durant

Human behavior, says Plato, flows from three main sources: desire, emotion, and knowledge.

All that is good in our history is gathered in libraries. At this moment, Plato is down there at the library waiting for us. So is Aristotle. Spinoza is there and so is Kats. Shelly and Byron adn Sam Johnson are there waiting to tell us their magnificent stories. All you have to do is walk in the library door and the great company open their arms to you. They are so happy to see you that they come out with you into the street and to your home. And they do what hardly any friend will — they are silent when you wish to think.

Why is it that great men so often have mediocrities for their offspring? Is it because the gamble of the genes that produced them — the commingling of ancestral traits and biological possibilities — was but a chance, and could not be expected to recur? Or is it because the genius exhausts in thought and toil the force that might have gone to parentage, and leaves only his diluted blood to his heirs? Or is it that children decay under ease, and early good fortune deprives them of the stimulus to ambition and growth?