“No one believes a liar even when he tells the truth”
“No one believes a liar. Even when she's telling the truth.”
“A liar will not be believed even when he speaks the truth.”
“And even a liar can be scared into telling the truth, same as honest man can be tortured into telling a lie.”
“It is worse for a liar to tell the truth than for a lover of truth to lie.”
“One can be absolutely truthful and sincere even though admittedly the most outrageous liar.”