“O thou that art named the house of Jacob, is the Spirit of the Lord straitened?”-Micah 2:7

There may be some who think they can convert the world by philosophy; that they can renew the heart by eloquence; or that, by some witchcraft of ceremonies, they can regenerate the soul; but we depend wholly and simply and alone on the Spirit of God. He alone worketh all our works in us; and in going forth to our holy service we take with us no strength, and we rely upon no power, except that of the Spirit of the Most High. When Asher’s foot was dipped in oil, no wonder he left a foot-mark wherever he went; but if his foot had not first been anointed, there would have been small trace of him; and unless we have the unction of the Holy One, and are endued with power from on high, in vain shall we seek to preach good tidings to the meek, to bind up the broken-hearted, or to proclaim the opening of the prison to them that are bound.

We need the Holy Spirit to prepare us for our work. He first gives the desire to go forth to the field of service, and only He can equip us for the fight. “The preparations of the heart in man, and the answer of the tongue, is from the Lord.” Let us seek, then, to be charged with the Holy Ghost; to receive to the full, the divine influence, and go to our labor thus amply prepared. There is no preparation for the work of God like being with God. Go up into the solitude with Christ, and then, when He calls you, you will be fit to go forth for Him, and tell what you have seen with Him in the Holy Mount. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2218.cfm