In the first sentence of this verse you is emphatic, and in the second sentence I is emphatic. Both sentences use the same main verb. In the first sentence Good News Translation translates it go on and in the second sentence going. The verb literally means “to go up” and was normally used of the pilgrimage up to Jerusalem. However, some commentators see here a play on words, since Jesus uses this same verb to speak of his ascent to the Father (20.17 I have not yet gone back up to the Father).

As Good News Translation points out in a footnote, some Greek manuscripts read “I am not yet going.” Although many manuscripts have this reading, “not yet” was evidently introduced into the text to resolve the inconsistency between verses 8 and 10. The force of Jesus’ words here is that he acts solely on the basis of God’s will, not on the suggestions or commands of any human being. Parallels are to be found at 2.4 and 11.6, where Jesus also rejects human authority for what he does.

In because the right time has not come the verb not come is not the same verb, so translated in verse 6. However, the meaning is essentially the same.

Quoted with permission from Newman, Barclay M. and Nida, Eugene A. A Handbook on the Gospel of John. (UBS Handbook Series). New York: UBS, 1980. For this and other handbooks for translators see here .