Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered. – Romans 8:26

Pray when you can pray, and pray when you cannot pray. “Alas, sir, I cannot get beyond a groan.” Brother, be not distressed, for the best praying in all the world consists of “groanings that cannot be uttered.” We may sometimes have a doubt whether the Spirit of God helps us to pray in cheerful prayers, though I do not say that there is any need for the doubt,-but we cannot have a question about our sad prayings, for it is expressly said He “maketh intercession for us with groanings which cannot be uttered.” Do you think that the chief end of a Christian’s life is to be comfortable? It is often more good to us to mourn like doves than to sing like nightingales. Sometimes there may be more prayer in a sigh than in a long oration. Often do I myself personally look back upon times of bondage when I cried to God with all my soul, and thought I did not pray, and I wish that I prayed now as I did then. Therefore always pray; whether you feel in a mind for prayer or not, still pray. The fisherman at Mentone keep on fishing with their great net; ay, by the score these fishermen take it out and haul it in again, and frequently they get no more than one little sardine for their pains. Many and many a time I have seen no more than they could hold in their hand as the produce of a net which covered acres of the sea. But why do they go on? Because they are fishermen, and cannot do anything else. You and I are praying men, and there is nothing else we can do but wait upon the Lord. So if, after many a throw of the net, we get but one small answer, we will try again, for this is all we can do. “Lord, to whom should we go but Thee?” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1480.cfm