Quintilian — Roman Educator

Marcus Fabius Quintilianus was a Roman rhetorician from Hispania, widely referred to in medieval schools of rhetoric and in Renaissance writing. In English translation, he is usually referred to as Quintilian, although the alternate spellings of Quintillian and Quinctilian are occasionally seen, the latter in older texts... (wikipedia)

Whilst we deliberate how to begin a thing, it grows too late to begin it.
Our minds are like our stomaches; they are whetted by the change of their food, and variety supplies both with fresh appetite.
While we are making up our minds as to when we shall begin, the opportunity is lost.
Those who wish to appear wise among fools, among the wise seem foolish.
The pretended admission of a fault on our part creates an excellent impression.