There is nothing stable in the world; uproar's your only music.

The only means of strengthening one's intellect is to make up one's mind about nothing, to let the mind be a thoroughfare for all thoughts.

Heard melodies are sweet, but those unheard
Are sweeter; therefore, ye soft pipes, play on.

Nothing ever becomes real till it is experienced.

There is nothing so stable as change.

I am certain of nothing but the holiness of the heart's affections, and the truth of imagination.