Mark 4:23

And let him learn that he is not to bury in unjust silence the instructions or the examples I give him; but must exercise them for the light and direction of others. (Bible de Vence)

II. It concerns those who hear the word of the gospel, to mark what they hear, and to make a good use of it, because their weal or woe depends upon it; what he had said before he saith again, If any man have ears to hear, let him hear, v. 23. Let him give the gospel of Christ a fair hearing; but that is not enough, it is added (v. 24), Take heed what ye hear, and give a due regard to that which ye do hear; Consider what ye hear, so Dr. Hammond reads it. Note, What we hear, doth us no good, unless we consider it; those especially that are to teach others must themselves be very observant of the things of God; must take notice of the message they are to deliver, that they may be exact. We must likewise take heed what we hear, by proving all things, that we may hold fast that which is good. We must be cautious, and stand upon our guard, lest we be imposed upon. To enforce this caution, consider,

Verses 21-34 These declarations were intended to call the attention of the disciples to the word of Christ. By his thus instructing them, they were made able to instruct others; as candles are lighted, not to be covered, but to be placed on a candlestick, that they may give light to a room. This parable of the good seed, shows the manner in which the kingdom of God makes progress in the world. Let but the word of Christ have the place it ought to have in a soul, and it will show itself in a good conversation. It grows gradually: first the blade; then the ear; after that the full corn in the ear. When it is sprung up, it will go forward. The work of grace in the soul is, at first, but the day of small things; yet it has mighty products even now, while it is in its growth; but what will there be when it is perfected in heaven!