Son of man, I have made thee a watchman unto the house of Israel: therefore hear the word at my mouth, and give them warning from me. I have made thee a watchman - The care and welfare of all this people I have laid on thee. Thou must watch for their safety, preach for their edification, and pray for their eternal welfare. And that thou mayest be successful, receive the word at my mouth, and warn them from me.
God is particularly jealous lest any words but his own be taught for Divine doctrines. He will not have human creeds, no more than Traditions, taught instead of his own word. No word can be successful in the salvation of sinners but that which comes from God. Every minister of the Gospel should be familiar with his Maker by faith and prayer; God will then hold communion with his spirit; otherwise, what he preaches will be destitute of spirit and life, and his hackneyed texts and sermons, instead of being the bread from heaven, will be like the dry mouldy Gibeonitish crusts.