Man is generally considered as inconsistent, unfaithful and a liar. It is not so with the Almighty God, for He doesn't change at will. He will never say A and do B. If your words are inconsistent with your actions, sooner, others will identify you as deceitful, liar and unreliable. If you made mistakes, humbly accept your chastisement from God. God is unchanging regarding His promises, to keep His faithfulness with you. He was faithful to David and we all are enjoying the covenant fulfilled in Jesus. He will keep His covenant of promises with you too, as long as you submit and love Him with all your heart. If there is a delay in yours, don't be discouraged, for God is on it, planning and working out it's fulfilment.