Happiness, though an indefinite concept, is the goal of all rational beings

How then is perfection to be sought? Wherein lies our hope? In education, and in nothing else.

Fallacious and misleading arguments are most easily detected if set out in correct syllogistic form.

It is therefore correct to say that the senses do not err — not because they always judge rightly, but because they do not judge at all.

In every department of physical science there is only so much science, properly so-called, as there is mathematics.

Enlightenment is man's emergence from his self-incurred immaturity.

Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them: the starry heavens above me and the moral law within me.