"It is most evident by the Works of God, that his understanding and power are infinite. ... Being thus infinite in understanding and power, he must also be perfectly holy; for unholiness always argues some defect, some blindness. Where there is no darkness or delusion, there can be no unholiness. ... God being infinite in power and knowledge, he must be self-sufficient and all-sufficient; therefore it is impossible that he should be under any temptation to do any thing amiss; for he can have no end in doing it. ... So God is essentially holy, and nothing is more impossible than that God should do amiss."
A bit by Johnathan Edwards from John Piper's book
A GOD-ENTRANCED VISION OF ALL THINGS