Bad books engender bad habits, but bad habits engender good books.

Good sense is the most equitably distributed of all things because no matter how much or little a person has, everyone feels so abundantly provided with good sense that he feels no desire for more than he already possesses.

The mind effortlessly and automatically takes in new ideas, which remain in limbo until verified or rejected by conscious, rational analysis.

Science is practical philosophy.

I am indeed amazed when I consider how weak my mind is and how prone to error.

I have concluded the evident existence of God, and that my existence depends entirely on God in all the moments of my life, that I do not think that the human spirit may know anything with greater evidence and certitude.

Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.