if you are ungrateful then surely allah is selfsufficient above all need of you and he does not like ungratefulness in his servants and if you are grateful he likes it in you and no bearer of burden shall bear the burden of another then to your lord is your return then will he inform you of what you did surely he is cognizant of what is in the breasts.
إن تكفروا فإن الله غني عنكم ولا يرضى لعباده الكفر وإن تشكروا يرضه لكم ولا تزر وازرة وزر أخرى ثم إلى ربكم مرجعكم فينبئكم بما كنتم تعملون إنه عليم بذات الصدور