 The same argument from ignorance or from humility is also put forward by John Locke in his Second Letter Concerning Toleration. Locke had to rely on this argument as an alternative strategy to defend freedom of conscience after the Anglican priest Jonas Proast pointed out that compulsion can actually change personal beliefs (as Augustine had argued), and that therefore the argument from ineffectiveness that Locke had used in his first Letter fails (Sorabji 2014: 151).