Moffatt(i)
12 Though by this time you should be teaching other people, you still need someone to teach you once more the rudimentary principles of the divine revelation. You are in need of milk, not of solid food.
13 (For anyone who is fed on milk is unskilled in moral truth; he is a mere babe.
14 Whereas solid food is for the mature, for those who have their faculties trained by exercise to distinguish good and evil.)