Adam Clarke on Matthew 13:34

All these things spoke Jesus - in parables - Christ descends from Divine mysteries to parables, in order to excite us to raise our minds, from and through natural things, to the great God, and the operations of his grace and Spirit. Divine things cannot be taught to man but through the medium of earthly things. If God should speak to us in that language which is peculiar to heaven, clothing those ideas which angelic minds form, how little should we comprehend of the things thus described! How great is our privilege in being thus taught! Heavenly things, in the parables of Christ, assume to themselves a body, and thus render themselves palpable.