Those who cannot remember the past
are condemned to repeat it.
- George Santayana

Who has fully realized that history
is not contained in thick books
but lives in our very blood?
- Carl Jung

There are recurring cycles, ups and downs,
but the course of events is essentially the same, with small variations.
It has been said that history repeats itself.
This is perhaps not quite correct; it merely rhymes.
- Theodor Reik (sometimes falsely attributed to Mark Twain)

Study the past, if you would divine the future.
- Confucius

The importance of history is in its
educational value for our lives today,
not in regret, resentment, or revenge.
- Jonathan Lockwood Huie