Be glad in the LORD, and rejoice, ye righteous: and shout for joy, all ye that are upright in heart. – Psalm 32:11

Rejoice in the Lord alway: and again I say, Rejoice. – Philippians 4:4

This blessed grace of joy is very contagious. It is a great privilege, I think, to meet a truly happy man, a graciously happy man. My mind goes back at this moment to that dear man of God who used to be with us, years ago, whom we called “Old Father Dransfield.” What a lump of sunshine that man was! I think that I never came into this place with a heavy heart, but the very sight of him seemed to fill me with exhilaration, for his joy was wholly in his God! An old man and full of years, but as full of happiness as he was full of days; always having something to tell you to encourage you. He constantly made a discovery of some fresh mercy for which we were again to praise God. O dear brethren, let us rejoice in the Lord, that we may set others rejoicing! One dolorous spirit brings a kind of plague into the house; one person who is always wretched seems to stop all the birds singing wherever he goes; but, as the birds pipe to each other, and one morning songster quickens all the rest, and sets the groves ringing with harmony, so will it be with the happy cheerful spirit of a man who obeys the command of the text, “Rejoice in the Lord alway.” This grace of joy is contagious.~ C.H. Spurgeon

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