There is one who makes himself rich, yet has nothing; and one who makes himself poor, yet has great riches. – Proverbs 13:7

Give yourself to Christ, and when you have used yourself for His glory, you will be more able to serve Him than you are now; you shall find your little stock grow as you spend it. Remember Bunyan’s picture of the man who had a roll of cloth. He unrolled it, and he cut off so much for the poor. Then he unrolled it, and cut off some more, and the more he cut it, the longer it grew…It is certainly so with talent and ability, and with grace in the heart. The more you use it, the more there is of it. It is often so with gold and silver: the store of the liberal man increases, while the miser grows poor. We have an old proverb, which is as true as it is suggestive: “Drawn wells have the sweetest waters.” So, if you keep continually drawing on your mind, your thoughts will get sweeter; and if you continue to draw on your strength, your strength will get to be more mighty through God. The more you do, the more you may do, by the grace of the Ever-blessed One!

How is it that so many able-bodied and gifted Christians seem to be so slow in the Master’s service?…You go all the year round without caring even for the spiritual welfare of a little child. One of our friends gave a good answer to a brother who said to him, “I have been a member of a church now for forty years. I am a father in Israel.” He asked him, “How many children have you? How many have you brought to Christ?” “Well,” the man said, “I do not know that I ever brought anybody to Christ.” Upon which our friend retorted, “Call yourself a father in Israel, and yet you have no children! I think you had better wait until you have earned the title.” So do I. It would be better that we had no professors of that sort, but that all our members, even were they much fewer, should be men and women constantly bringing forth fruit unto God in the conversion of others. The Lord set you all to work with this object! ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2216.cfm