The calling of God on a minister's life defies human logic. Our heavenly Father does not want His servants contaminated by apostate doctrines or vain philosophy.

Suppose God calls a man educated in a particular religious tradition (as was the Apostle Paul). God must 'undo' that education and training before He can use him to minister to His elect. Hence, after his initial conversion, Paul spent about fourteen years working as a tent maker, being deprogrammed from Pharisee traditions before starting his ministry.