The meek also shall increase their joy in the LORD, and the poor among men shall rejoice in the Holy One of Israel. – Isaiah 29:19

I am sure that there is a mighty influence wielded by a consistently joyous spirit. See how little children are affected by the presence of a happy person. There is much more in the tone of the life than there is in the particular fashion of the life. It may be the life of one who is very poor, but oh, how poverty is gilded by a cheerful spirit! It may be the life of one who is well read and deeply instructed; but, oh, if there be a beauty of holiness, and a beauty of happiness added to the learning, nobody talks about “the blue stocking,” or “the bookworm” being dull and heavy. Oh, no, there is a charm about holy joy! I wish we had more of it! There are many more flies caught with honey than with vinegar; and there are many more sinners brought to Christ by happy Christians than by doleful Christians. Let us sing unto the Lord as long as we live; and, mayhap, some weary sinner, who has discovered the emptiness of sinful pleasure, will say to himself, “Why, after all, there must be something real about the life of these Christians; let me go and learn how I may have it.” And when he comes and sees it in the light of your gladsome countenance, he will be likely to learn it, God helping him, so as never to forget it…for joy is a most influential grace, and every child of God ought to possess it in a high degree.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2405.cfm