Cunning leads to knavery. It is but a step from one to the other, and that very slippery. Only lying makes the difference; add that to cunning, and it is knavery.
The dove, O hawk, that has once been wounded by thy talons, is frightened by the least movement of a wing.
[Lat., Terretur minimo pennae stridore columba
Unguibus, accipiter, saucia facta tuis.]
Adde, quod ingénues didicisse fideliter artes Emollit mores, nec sinit esse fervos. To be instructed in the arts, softens the manners and makes men gentle.