When he took time to help the man up the mountain, lo, he scaled it himself.

Tibetan Proverb

Before enlightenment; chop wood, carry water. After enlightenment; chop wood, carry water.

Buddha

What's done is done.

Hilliard MacBeth

Monday is the key day of the week.

Gaelic Proverb

Tomorrow is often the busiest day of the week.

Spanish proverb

The continuous drip polishes the stone.

Peruvian saying