en_tn/1co/16/07.md

I do not wish to see you now

Paul is stating that he does not want to come for just a short visit now but for a longer period of time later.

Pentecost

Paul would stay in Ephesus until this festival (May or June), later travel through Macedonia, and later try to arrive in Corinth before winter started in November.

a wide door has opened

This means that the Lord had given him a good opportunity to win people to the gospel. (See: rc://en/ta/man/translate/figs-metaphor)