The mind of man may be compared to a musical instrument with a certain range of notes, beyond which in both directions we have an infinitude of silen… - John Tyndall

Underneath his sweetness and gentleness was the heat of a volcano. [Michael Faraday] was a man of excitable and fiery nature; but through high self-discipline he had converted the fire into a central glow and motive power of life, instead of permitting it to waste itself in useless passion.

The logical feebleness of science is not sufficiently borne in mind. It keeps down the weed of superstition, not by logic but by slowly rendering the mental soil unfit for its cultivation.

Knowledge once gained casts a light beyond its own immediate boundaries.