(Genesis 6)
It was no easy thing for Noah to build the ark amid the scoffing of his generation. Smart witticisms fell around him like hail. All the ‘practical men’ thought him a dreamy fool wasting his time while they prospered and made something of life … for long years the wits laughed and the ‘common-sense’ people wondered, and the patient saint went on hammering and pitching at his ark. But one morning it began to rain; and by degrees somehow Noah did not seem quite such a fool. The jests would look rather different when the water got up to the knees of the jesters; and their sarcasms would stick in their throats as they drowned. So it is always. So it will be at the last Day.
(Alexander MacLaren)
"Therefore the Lord himself will give you a sign: The virgin will be with child and will give birth to a son, and you will call him Immanuel."
Isaiah 7: 14