Note: I suggest that the conversation/interrogation the Jews have with Jesus that extends from verse 12 to the end of the chapter is made up of three structures. Each one is chiastic. Here is the first:
A (12) Then spake Jesus again unto them, saying, I am the light of the world: he that followeth me shall not walk in darkness, but shall have the light of life.
B (13) The Pharisees therefore said unto him, Thou bearest record of thyself; thy record is not true. 14 Jesus answered and said unto them, Though I bear record of myself, yet my record is true: for I know whence I came, and whither I go; but ye cannot tell whence I come, and whither I go.15 Ye judge after the flesh; I judge no man. 16 And yet if I judge, my judgment is true: for I am not alone, but I and the Father that sent me. 17 It is also written in your law, that the testimony of two men is true. 18 I am one that bear witness of myself, and the Father that sent me beareth witness of me.
C 19 Then said they unto him, Where is thy Father? Jesus answered, Ye neither know me, nor my Father: if ye had known me, ye should have known my Father also. 20 These words spake Jesus in the treasury, as he taught in the temple: and no man laid hands on him; for his hour was not yet come.
D 21 Then said Jesus again unto them, I go my way, and ye shall seek me, and shall die in your sins: whither I go, ye cannot come. 22Then said the Jews, Will he kill himself? because he saith, Whither I go, ye cannot come.
E (23) And he said unto them, Ye are from beneath; I am from above: ye are of this world; I am not of this world.
D’ (24) I said therefore unto you, that ye shall die in your sins: for if ye believe not that I am he, ye shall die in your sins.
C’ (25) Then said they unto him, Who art thou? And Jesus saith unto them, Even the same that I said unto you from the beginning.
B’ (26) I have many things to say and to judge of you: but he that sent me is true;
A’ and I speak to the world those things which I have heard of him.