Ignorance above other sins enslaves a soul to Satan. A knowing man may be his slave, but an ignorant one can be no other. Knowledge doth not make the heart good, but it is impossible that without knowledge it should be good. There are some sins which an ignorant person cannot commit, there are more which he cannot but commit; knowledge is the key, Luke 11:52; Christ the door, John 10. Christ opens heaven. Knowledge opens Christ. – William Gurnall, The Christian in Complete Armour.