God beareth Me witness, I was not a man of learning, for I was trained as a merchant. In the year sixty God graciously infused my soul with the conclusive evidences and weighty knowledge which characterize Him Who is the Testimony of God — may peace be upon Him — until finally in that year I proclaimed God's hidden Cause and unveiled its well-guarded Pillar, in such wise that no one could refute it. 'That he who should perish might perish with a clear proof before him and he who should live might live by clear proof.'

Epistle to Muhammad Sháh