Change your opinions, keep to your principles; change your leaves, keep intact your roots.
What is history? An echo of the past in the future; a reflex from the future on the past.
An invasion of armies can be resisted, but not an idea whose time has come.
Forty is the old age of youth; fifty the youth of old age.
When grace is joined with wrinkles, it is adorable. There is an unspeakable dawn in happy old age.
He who opens a school door, closes a prison.
