I say that habit's but a long practice, friend, and this becomes men's nature in the end.

Man is a goal-seeking animal. His life only has meaning if he is reaching out and striving for his goals.

My lectures are published and not published; they will be intelligible to those who heard them, and to none beside.

The best way to avoid envy is to deserve the success you get.

Metaphysics is universal and is exclusively concerned with primary substance. ... And here we will have the science to study that which is, both in its essence and in the properties which it has.

One thing alone not even God can do,To make undone whatever hath been done.

Happiness is activity.