Now will I sing to my Well-beloved a song of my Beloved… – Isaiah 5:1

O Lord, open my lips, and my mouth shall show forth Your praise. – Psalm 51:15

“Now will I sing.” Does not that imply that there were times when he who spake these words could not sing? “Now,” said he, “will I sing to my Well-beloved.” There were times, then, when his voice, and his heart, and his circumstances were not in such order that he could praise God. My brethren, a little while ago we could not sing to our Well-beloved, for we did not love Him, we did not know Him, we were dead in trespasses and sins. Perhaps we joined in sacred song, but we mocked the Lord. We stood up with His people, and we uttered the same sounds as they did, but our hearts were far from Him. Let us blush for those mock psalms; let us shed many a tear of repentance that we could so insincerely have come before the Lord Most High. After that, we were led to feel our state by nature, and our guilt lay heavy upon us. We could not sing to our Well-beloved then. Our music was set to the deep bass and in the minor key. We could only bring forth sighs and groans…Brethren in Christ Jesus, it is now some years ago since we believed in Christ, but since then there have been times when we could not sing. Alas! for us, there was a time when we watched not our steps, but went astray, when the flatterer led us from the strait road that leads to heaven, and brought us into sin; and then the chastisement of God came upon us, our heart was broken, until we cried out in anguish, as David did in the 51st Psalm. Then if we did sing, we could only bring out penitential odes, but no songs. We laid aside all parts of the book of Psalms that had to do with Hallelujah, and we could only groan forth the notes of repentance. There were no songs for us then, till at last Emmanuel smiled upon us once more, and we were reconciled again, brought back from our wanderings and restored to a sense of the divine favour. It is not always summer weather with the best of us. Though for the most part:

“We can read our title clear,
To mansions in the skies,”

~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3476.cfm