Neither divine grace nor natural knowledge ever diminishes freedom.

So blind is the curiosity by which mortals are possessed, that they often conduct their minds along unexplored routes, having no reason to hope for success, but merely being willing to risk the experiment of finding whether the truth they seek lies there.

Travelling is almost like talking with those of other centuries.

In the matter of a difficult question it is more likely that the truth should have been discovered by the few than by the many.

... moral certainty is certainty which is sufficient to regulate our behaviour, or which measures up to the certainty we have on matters relating to the conduct of life which we never normally doubt, though we know that it is possible, absolutely speaking, that they may be false.

When writing about transcendental issues, be transcendentally clear.

Reason is nothing without imagination.