[65] subsequently practise therefore is mediocrity not perfection, for it takes place not in perfect souls, but in such as are seeking after perfection. But it is the perfect duty of guardianship to deliver to memory the well-practised contemplations of holy things, the excellent deposit of knowledge to a faithful guardian, who is the only one who disregards the ingenious and manifold nets of forgetfulness; so that the Scripture, with great propriety and felicity, calls him who is mindful of what he has learnt, the guardian of it.