Henry Wadsworth Longfellow
Look not mournfully into the past. It comes not back again. Wisely improve the present. It is thine. Go forth to meet the shadowy future, without fear.
We judge ourselves by what we feel capable of doing, while others judge us by what we have already done.
Perseverance is a great element of success. If you only knock long enough and loud enough at the gate, you are sure to wake up somebody.
If we could read the secret history of our enemies, we should find in each life sorrow and suffering enough to disarm all hostility.