Isaiah 48:6-8 English Standard Version
6 “You have heard; now see all this; and will you not declare it? From this time forth I announce to you new things, hidden things that you have not known. 7 They are created now, not long ago; before today you have never heard of them, lest you should say, ‘Behold, I knew them.’ 8 You have never heard, you have never known, from of old your ear has not been opened. For I knew that you would surely deal treacherously, and that from before birth you were called a rebel.
John 3:9-15 English Standard Version
9 Nicodemus said to him, “How can these things be?” 10 Jesus answered him, “Are you the teacher of Israel and yet you do not understand these things? 11 Truly, truly, I say to you, we speak of what we know, and bear witness to what we have seen, but you do not receive our testimony. 12 If I have told you earthly things and you do not believe, how can you believe if I tell you heavenly things? 13 No one has ascended into heaven except he who descended from heaven, the Son of Man. 14 And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, 15 that whoever believes in him may have eternal life.
Here in John 3, Jesus is reminding Nicodemus of God’s Word in Isaiah 48 and is announcing that He is the Son of Man and is here to declare this new thing never heard before. It is not hidden from us and we can see why Jesus declares it to Nicodemus. The time is now.
John 3:16-17 English Standard Version
16 “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. 17 For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him.”