Meat as Intellectual Depth

'"Christ," says Calvin, "is milk for babes, and strong meat for men."  Every doctrine which can be taught to theologians  is taught to young children.  We teach a child that God is a Spirit, everywhere present and knowing all things; and he understands it.  We tell him that Christ is God and man in two distinct natures and one person forever.  This to the child is milk, but it contains food for angels. The truth expressed in these propositions may be expanded indefinitely, and furnish nourishment for the highest intellects to eternity.  The difference between milk and strong meat, according to this view, is simply the difference between the more or less perfect development of the things taught.'

-- Charles Hodge on 1 Cor. 3:2, quoted in John Murray, Collected Writings, Vol 1.