Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ’s sake: for when I am weak, then am I strong. – 2 Corinthians 2:10

Dear friends, do you not think that we also treat the Spirit of God as though He were straitened when we imagine that our weakness hinders His working by us. “Oh,” says one, “I have no doubt that God can bless a great many by you!” Well, dear fiend, if you knew what I am often obliged to feel of myself, you would never talk so. I am the weakest of you all, in my own apprehension. Another says, “I know that I am inferior in ability, in knowledge, in opportunity.” Just so, dear friend; and therefore you suppose that the Spirit of God cannot use you. Do you not see, that, though you think such a confession is an evidence of humility, you are straitening the Spirit of God? However weak and feeble you may be, He can use you. If you think that He cannot, you deprive Him of power in your apprehension. It is not yourself, you see, that you are lowering, you are really lowering the power of God. He can use a person who is very insignificant, very obscure, very unlearned, very feeble. Nay, He delights to do this; and He makes even those that are strong feel weak before He uses them, so that they say, “When I am weak, then am I strong.” He will use empty vessels, and if you do not want emptying because you are empty already, then there is one little thing that needs not to be done, and God can begin with you at once. There is nothing in you-nothing. Now, if God will use you, He will manifestly have all the glory. Believe that He can use you, and get to work, and do something. Tell out His gospel. Tell it over and over again. Tell it where you have told it, or where you have never told it, and believe that God can use you; AND HE WILL! Else, if you say, “He cannot use me,” I shall put the question to you again, “Is the Spirit of the Lord straitened?”~ C.H. Spurgeon

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