Water

We never know the worth of water till the well is dry.

- English proverb


One kernel is felt in a hogshead; one drop of water helps
to swell the ocean; a spark of fire helps to give light to the
world. None are too small, too feeble, too poor to be of
service. Think of this and act.

- Hannah More


Upon those who step into the same rivers different and
ever different waters flow down.

- Heraclitus of Ephesus