The man whose horse trots a mile in a minute does not carry the most important messages.

He is not a true man of science who does not bring some sympathy to his studies, and expect to learn something by behavior as well as by application. It is childish to rest in the discovery of mere coincidences, or of partial and extraneous laws. The study of geometry is a petty and idle exercise of the mind, if it is applied to no larger system than the starry one. Mathematics should be mixed not only with physics but with ethics; that is mixed mathematics. The fact which interests us most is the life of the naturalist. The purest science is still biographical.

I never found the companion that was so companionable as solitude. [It allows you to] be the Mungo Park, the Lewis and Clark of your own streams and oceans; [to] explore your own higher latitudes; [to] be a Columbus to whole new continents and worlds within you, opening new channels, not of trade, but of thought.

A man sits as many risks as he runs.

We could not help contrasting the equanimity of Nature with the bustle and impatience of man. His words and actions presume alwaysa crisis near at hand, but she is forever silent and unpretending.

Nature is slow, but sure; she works no faster than need be; she is the tortoise that wins the race by her perseverance.

As we grow older, we live more coarsely, we relax a little in our disciplines, and, to some extent, cease to obey our finest instincts. But we should be fastidious to the extreme of sanity, disregarding the gibes of those who are more unfortunate than ourselves.