Take this at least, this last ...

Take this at least, this last advice, my son:
Keep a stiff rein, and move but gently on:
The coursers of themselves will run too fast,
Your art must be to moderate their haste.
Take this at least, this last advice, my son: Keep a stiff rein, and move but gently on: The coursers of themselves will run too fast, Your art must be to moderate their haste.

Quotes from the same author

All things change; nothing perishes.
The cause is hidden. The effect is visible to all.
The essence of true friendship is to make allowance for another's little lapses.
Let your hook always be cast; in the pool where you least expect it, there will be a fish.
Chance is always powerful. Let your hook be always cast; in the pool where you least expect it, there will be a fish.