“If you don't want to slip up tomorrow, speak the truth today.”
“Even idiots ocasionally speak the truth accidentally.”
“A liar will not be believed even when he speaks the truth.”
“Even today, I've no idea what the truth is, or what I did with it.”
“A man may say, "From now on I'm going to speak the truth." But the truth hears him and runs away and hides before he's even done speaking.”