You have covered yourself with a cloud, that our prayer should not pass through.
All Commentaries on Lamentations 3:44 Go To Lamentations 3
Second, is a refusal from prayer of a person sinning. Verse 44 thus says: "Thou hast wrapped thyself with a cloud", Namely, regarding such sins displaying faults against prayer. Thus, Isaiah 59:2 claims: "But your iniquities have made a separation between you and your God."