John 3:11-13

3:11 I tell you the solemn truth, we speak about what we know and testify about what we have seen, but you people do not accept our testimony. 3:12 If I have told you people about earthly things and you don’t believe, how will you believe if I tell you about heavenly things? 3:13 No one has ascended into heaven except the one who descended from heaven – the Son of Man.