The strictest law often causes the most serious wrong

Though liberty is established by law, we must be vigilant, for liberty to enslave us is always present under that very liberty. Our Constitution speaks of the "general welfare of the people." Under that phrase all sorts of excesses can be employed by lusting tyrants to make us bondsmen.

Nature has planted in our minds an insatiable longing to see the truth.

That last day does not bring extinction to us, but change of place.

What nobler employment, or more valuable to the state, than that of the man who instructs the rising generation?

Philosophy is true mother of the arts [of science].

To reduce man to the duties of his own city, and to disengage him from duties to the members of other cities, is to break the universal society of the human race.