The true method of discovery is like the flight of an aeroplane. It starts from the ground of particular observation; it makes a flight in the thin air of imaginative generalization; and it again lands for renewed observation rendered acute by rational interpretation.

The merely well-informed man is the most useless bore on God's earth.

The future belongs to those who can rise above the confines of the earth.

Our minds are finite, and yet even in these circumstances of finitude we are surrounded by possibilities that are infinite, and the purpose of life is to grasp as much as we can out of that infinitude.

The absolute pacifist is a bad citizen; times come when force must be used to uphold right, justice and ideals.

Problems are only opportunities in disquise.

The art of progress is to preserve order amid change and to preserve change amid order.