Economy does not lie in sparing money, but in spending it wisely.

Mathematics may be compared to a mill of exquisite workmanship, which grinds your stuff to any degree of fineness.

We live in the hope and faith that, by the advance of molecular physics, we shall by-and-by be able to see our way as clearly from the constituents of water to the properties of water, as we are now able to deduce the operations of a watch from the form of its parts and the manner in which they are put together.

Time, whose tooth gnaws away everything else, is powerless against truth.

There is no greater mistake than the hasty conclusion that opinions are worthless because they are badly argued.

Science is simply common sense at its best.

Mathematics may be compared to a mill of exquisite workmanship, which grinds you stuff of any degree of fineness; but, nevertheless, what you get out depends upon what you put in; and as the grandest mill in the world will not extract wheat-flour from peascods, so pages of formulae will not get a definite result out of loose data.