The defendant wants to hide the truth because he's generally guilty. The defense attorney's job is to make sure the jury does not arrive at that truth.
“If only I was as eloquent as Demosthenes, I would have to do no more than repeat a single word three times.”
“We must expect reverses, even defeats. They are sent to teach us wisdom and prudence, to call forth greater energies, and to prevent our falling into greater disasters.”