One should be ever booted and spurred and ready to depart.

It is easier to sacrifice great than little things.

A man must become wise at his own expense.

There is nothing on which men are commonly more intent than on making a way for their opinions.

I look upon the too good opinion that man has of himself, as the nursing mother of all false opinions, both public and private.

A young man ought to cross his own rules, to awake his vigor, and to keep it from growing faint and rusty. And there is no course of life so weak and sottish as that which is carried on by rule and discipline.

Now, since our condition accommodates things to itself, and transforms them according to itself, we no longer know things in their reality; for nothing comes to us that is not altered and falsified by our Senses. When the compass, the square, and the rule are untrue, all the calculations drawn from them, all the buildings erected by their measure, are of necessity also defective and out of plumb. The uncertainty of our senses renders uncertain everything that they produce.