But Noah found grace in the eyes of the LORD. – Genesis 6:8

By faith Noah, being warned of God of things not seen as yet, moved with fear… -Hebrews 11:7

Faith moulded him, but fear moved him. How was this? “I thought,” says one, “that perfect love casteth out fear.” Yes, fear of a certain sort; but there is another fear which perfect love embraces and nourishes. Noah had no evil fear. He had not a servile fear: he was not afraid of God as a culprit is afraid of a judge, or a convict of the hangman. He knew whom he believed, and was persuaded that He had a favour towards him. Noah had not a careless fear, as some here have. Fools say, “We never shall be saved, and therefore it would be useless to care about it. We may as well gather the rosebuds while we may. There is no heaven for us hereafter, let us make the best of the present.” No, Noah was a witness against such sensual carelessness. He so believed, that fear came upon him, and that fear made him act as God bade him. Beware of the unbelief which enables you to trifle; for trifling with eternal things is the suicide of the soul. Noah, on the other hand, had not a despairing fear, as some have. They say, “There is no hope. We have gone too far in sin already to dream of pardon and favour. We may as well let things take their course.” Beware of the poison-cup of despair. While life lasts hope lasts; and we beseech you not to lie down in sullen hopelessness. Noah was a stranger to this paralyzing fear: he bestirred himself, and built an ark. Some allow a presuming fear: “If I am to be saved,” say they, “I shall be saved; and if I am to be lost, I shall be lost. I may as well be hung for a sheep as a lamb, and so I will have my fling, and go into sin even as I please.” Noah never spoke thus; for with his fear he had a good hope. He prepared an ark. He knew that none could save him but God; but as God bade him prepare an ark, an ark he prepared, and thus he was saved and his house. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2147.cfm