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.
In your judgment virtue requires no reward, and is to be sought for itself, unaccompanied by external benefits.
[Lat., Judice te mercede caret, per seque petenda est
Externis virtus incomitata bonis.]