Let us strive the more earnestly therefore to lengthen out our span of life-- life that is poured out like water and falls as the leaf-- if not by action (the means to which lie in another's power), yet in any case by study and research; and since it is not granted us to live long, let us transmit to posterity some memorial that we have at least lived.

He [Pliny the Elder] used to say that 'no book [etc] was so bad but some good might be got out of it'.

Never do a thing concerning the rectitude of which you are in doubt.

For however often a man may receive an obligation from you, if you refuse a request, all former favors are effaced by this one denial.

It is wonderful how the mind is stirred and quickened into activity by brisk bodily exercise.

Everyone must be given something he can grasp and recognize as his own idea.

Objects which are usually the motives of our travels by land and by sea are often overlooked and neglected if they lie under our eye.