Reason can never prove the existence of God.

Thrift is care and scruple in the spending of one's means. It is not a virtue and it requires neither skill nor talent.

Nature does nothing in vain, and in the use of means to her goals she is not prodigal.

Nature, when left to universal laws, tends to produce regularity out of chaos.

If, like Hume, I had all manner of adornment in my power, I would still have reservations about using them. It is true that some readers will be scared off by dryness. But isn't it necessary to scare off some if in their case the matter would end up in bad hands?

The light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space.

If education is to develop human nature so that it may attain the object of its being, it must involve the exercise of judgment.