An algorithm must be seen to be believed. Donald Knuth
Every writer wants to be believed. But every writer knows he is spurious; every fiction writer would rather be credible than authentic. John le Carré
The poet never asks for admiration; he wants to be believed. Jean Cocteau
If you want some lies to be believed wrap them up in truths. Danish Proverb
Who has lied once will not be believed the second time. Estonian Proverb
The oaths of one who loves a woman are not to be believed. Spanish Proverb