An adage I recall from when I was a boy: “If you put a single teaspoon of sewage into a barrel of wine, you have only a barrel of sewage.” Today, a friend shared with me a finer rendering of this ancient principle, spoken by Śāntideva, a Buddhist monk who flourished between 685 and 763 CE:
All the good works gathered in a thousand ages,
Such as deeds of generosity,
And the offerings to the Blissful Ones –
A single flash of anger shatters them.