Where is this verse found, and who is asking the question? Answer the question, share how it speaks into your life, and then post a scripture about God and what He says, for the next person to answer.
God is not a man, that He should tell {or} act a lie, neither the son of man, that He should feel repentance {or} compunction [for what He has promised]. Has He said and shall He not do it? Or has He spoken and shall He not make it good?