John Mason

Other sciences are suited to the various conditions of life: some, more necessary to some; other, to others. But this [science of self-knowledge] equally concerns every one.

Every one of a common capacity hath the opportunity and ability to attain [self-knowledge], if he will but recollect his rambling thoughts, turn them in upon himself, watch the motions of his heart.

He who does not improve his temper together with his understanding, is not much the better for it.