One should aim not at being possible to understand, but at being impossible to misunderstand.

For it would have been better that man should have been born dumb, nay, void of all reason, rather than that he should employ the gifts of Providence to the destruction of his neighbor.

Consequently the student who is devoid of talent will derive no more profit from this work than barren soil from a treatise on agriculture.

For all the best teachers pride themselves on having a large number of pupils and think themselves worthy of a bigger audience.

While we are making up our minds as to when we shall begin. the opportunity is lost.

That which prematurely arrives at perfection soon perishes.

While we are examining into everything we sometimes find truth where we least expected it.