Passage
I am <FI>one<Fi> who is testifying of myself, and the Father who sent me doth testify of me.'
I am <FI>one<Fi> who is testifying of myself, and the Father who sent me doth testify of me.'
John 8:16 and even if I do judge my judgment is true, because I am not alone, but I and the Father who sent me;
John 8:17 and also in your law it hath been written, that the testimony of two men are true;
John 8:18 I am <FI>one<Fi> who is testifying of myself, and the Father who sent me doth testify of me.'
John 8:19 They said, therefore, to him, `Where is thy father?' Jesus answered, `Ye have neither known me nor my Father: if me ye had known, my Father also ye had known.'
John 8:20 These sayings spake Jesus in the treasury, teaching in the temple, and no one seized him, because his hour had not yet come;
The verse centers on "testifying", "myself", "father", "sent", and "doth". It is saying that the verse draws attention to "testifying" and "myself", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 17's "and also in your law it hath..." into verse 19's "They said therefore to him Where is...", so "testifying" and "myself" belong inside that flow. In John context, the local focus is the identity of Jesus, new birth, eternal life, and belief and unbelief.
A plain takeaway is to answer the verse's own emphasis on "testifying" and "myself" with trust shaped by these words, not by a vague optimism outside the passage.