The past does not interest, the present does not satisfy, the future…

The one condition under which all powers, and consequently the intellectual faculties, are developed, is exercise.

The question—Is Truth, or is the Mental Exercise in the pursuit of truth, the superior end?—this is perhaps the most curious theoretical, and certainly the most important practical, problem in the whole compass of philosophy.

Be sober, and to doubt prepense, These are the sinews of good sense.

Truth like a torch, the more 'tis shook, it shines.

The primary principle of education is the determination of the pupil to self-activity — the doing nothing for him which he is able to do for himself.

"Sordet cognita veritas" is a shrewd aphorism of Seneca. A truth, once known, falls into comparative insignificance.