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.
When a house is tottering to its fall,
The strain lies heaviest on the weakest part,
One tiny crack throughout the structure spreads,
And its own weight soon brings it toppling down.
The raven once in snowy plumes was drest,
White as the whitest dove's unsullied breast,
Fair as the guardian of the Capitol,
Soft as the swan; a large and lovely fowl
His tongue, his prating tongue had changed him quite
To sooty blackness from the purest white.