In the midst of hopes and cares, of apprehensions and of disquietude, regard every day that dawns upon you as if it was to be your last; then super-added hours, to the enjoyment of which you had not looked forward, will prove an acceptable boon.
The poets aim is either to profit or to please, or to blend in one the delightful and the useful. Whatever the lesson you would convey, be brief, that your hearers may catch quickly what is said and faithfully retain it. Every superfluous word is spilled from the too-full memory.
It will be practicable to blot written words which you do not publish; but the spoken word it is not possible to recall.
[Lat., Delere licebit
Quod non edideris; nescit vox missa reverti.]