Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment.
Buddha

Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.
Marie Curie

Some people say video games rot your brain, but I think they work different muscles that maybe you don't normally use.
Ezra Koenig

Whoever does not miss the Soviet Union has no heart. Whoever wants it back has no brain.
Vladimir Putin