"When I was younger, I could remember anything, whether it happened or not." — Mark Twain

Our truest life is when we are in dreams awake

Source: A Week on the Concord and Merrimack Rivers (1849)

If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them.

Source: Walden (1854)

Four seasons fill the measure of the year; there are four seasons in the mind of man

Source: The Human Seasons (1818)

Nothing ever becomes real till it is experienced

Source: Letters of John Keats (1817-1820)

Talking with a friend is nothing else but thinking aloud

Source: The Spectator, no. 225 (1711)

A thing is not necessarily true because a man dies for it.

Source: Miscellaneous Aphorisms (1911)

Mark Twain Quote