Reservoir

"If then you are wise, you will show yourself rather as a reservoir than as a canal. For a canal spreads abroad water as it receives it, but a reservoir waits until it is filled before overflowing, and thus communicates, without loss to itself, its superabundant water. In the [world] at the present day, we have many canals, few reservoirs"
- Bernard of Clairvaux, 1099