And the LORD said unto Moses, Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might shew these my signs before him:
Show these my signs ... Sinners even of the worst description are to be admonished, even though there may be little hope of amendment; and hence, those striking miracles that carried so clear and conclusive demonstration of the being and character of the true God were performed in lengthened series before Pharaoh, to leave him without excuse, when judgment should be finally executed.