Freedom is absolutely necessary for the progress in science and the liberal arts.

All is One (Nature, God)

I do not presume that I have found the best philosophy, I know that I understand the true philosophy.

One and the same thing can at the same time be good, bad, and indifferent, e.g., music is good to the melancholy, bad to those who mourn, and neither good nor bad to the deaf.

If the way which I have pointed out as leading to this result (i.e., power over the emotions by which the wise man surpasses the ignorant man) seems exceedingly hard, it may nevertheless be discovered. Needs must it be hard, since it is so seldom found. How would it be possible, if salvation were ready to our hand, and could without great labour be found, that it should be by almost all men neglected? But all things excellent are as difficult as they are rare.

Everything in nature is a cause from which there flows some effect.

The eternal wisdom of God ... has shown itself forth in all things, but chiefly in the mind of man, and most of all in Jesus Christ.