John Wesley on Luke 6:39

He spake a parable - Our Lord sometimes used parables when he knew plain and open declarations would too much inflame the passions of his hearers. It is for this reason he uses this parable, Can the blind lead the blind? - Can the scribes teach this way, which they know not themselves? Will not they and their scholars perish together? Can they make their disciples any better than themselves? But as for those who will be my disciples, they shall be all taught of God; who will enable them to come to the measure of the stature of the fulness of their Master. Be not ye like their disciples, censuring others, and not amending yourselves. Mt 15:14.