No technical knowledge can outweigh knowledge of the humanities.

Imagination without deep and full knowledge is a snare.

The limit of man's knowledge in any subject possesses a high interest which is perhaps increased by its close neighbourhood to the realms of imagination.

Knowledge of what is does not open the door directly to what should be.

There comes a time when the mind takes a higher plane of knowledge but can never prove how it got there.

One whose knowledge is confined to books and whose wealth is in the possession of others, can use neither his knowledge nor wealth when the need for them arises.