I was reflecting on the faith theology in these verses and came up with a statement. It seems that the passage assumes a person will “receive the witness.” I admit that 3:18 could be interpreted to reflect a different theology, that all are condemned prior to knowing about Yeshua. Yet I am wondering if 3:18 and 3:31-36 could not both be read to mean that condemnation comes from rejecting the truth once it is revealed. Anyway, here is the statement that I came to and below that the verses from John for your consideration: To encounter him is to see enough of him to realize his identity, in seeing his identity to be convinced he is above all, and being convinced either to believe or to deny the evident truth for willful reasons.
John 3:31-36, He who comes from above is above all; he who is of the earth belongs to the earth, and of the earth he speaks; he who comes from heaven is above all. He bears witness to what he has seen and heard, yet no one receives his testimony; he who receives his testimony sets his seal to this, that God is true. For he whom God has sent utters the words of God, for it is not by measure that he gives the Spirit; the Father loves the Son, and has given all things into his hand. He who believes in the Son has eternal life; he who does not obey the Son shall not see life, but the wrath of God rests upon him.