Those who claim to preach the word should preach the word, ever remembering that they are laborers together with God. He is their efficiency, and if He is given opportunity He will work for them. If they are humble, if they do not rely upon their own supposed wisdom and ability, God will place arguments in their mind and speak through their lips. He will also impress the minds of the hearers, preparing their hearts to receive the seed which is sown. TM 311.3
My brother, a daily work must be done for you by the power of God, or else, instead of the Holy Spirit, the enemy of God and man will stand by your side. Under his influence, weakness will appear in your work. The most precious points of faith relative to the salvation of the soul will be marred and mutilated in your hands. TM 312.1
Unless you change your manner of labor, you will give a faulty education to those connected with you in the work. Let your heart struggle and break for the longing it has for God, the living God. Let nothing divert your mind from the work of God to unimportant matters. With all your God-given energies work earnestly and prayerfully, calling upon the church to cooperate with you. Put no trust in yourself, but rest in the assurance that God is the chief Worker. You are only His servant; and your work is to voice His words, “We are laborers together with God.” TM 312.2