Mathematics should be mixed not only with physics but with ethics.

What a healthy out-of-door appetite it takes to relish the apple of life, the apple of the world, then!

Surely the fates are forever kind, though Nature's laws are more immutable than any despot's, yet to man's daily life they rarelyseem rigid, but permit him to relax with license in summer weather. He is not harshly reminded of the things he may not do.

Within the memory of many of my townsmen the road near which my house stands resounded with the laugh and gossip of inhabitants, and the woods which border it were notched and dotted here and there with their little gardens and dwellings, though it was then much more shut in by the forest than now.

Long enough I had heard of irrelevant things; now at length I was glad to make acquaintance with the light that dwells in rotten wood. Where is all your knowledge gone to? It evaporates completely, for it has no depth.

That aim in life is highest which requires the highest and finest discipline.

Life in us is like the water in a river.