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

Buddha

Practice is this life, and realization is this life, and this life is revealed right here and now.

Maezumi Roshi

Don't try to steer the river.

Deepak Chopra

Composure is the ruler of instability.

Lao Tzu

Estar tranquilo/a es el mayor logro del ser.

Yogi Bhajan

Retire to the center of your being, which is calmness.

Paramahansa Yogananda