The reading of all good books is indeed like a conversation with the noblest men of past centuries who were the authors of them, nay a carefully studied conversation, in which they reveal to us none but the best of their thoughts.

The long concatenations of simple and easy reasoning which geometricians use in achieving their most difficult demonstrations gave me occasion to imagine that …

The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.

Perfect numbers like perfect men are very rare.

A great library easily begets affection, which may deepen into love;

My days among the Dead are past; Around me I behold, Where'er these casual eyes are cast, The mighty minds of old; My never-failing friends are they, With whom…

Like all those possessing a library, Aurelian was aware that he was guilty of not knowing his in its entirety.