Paul speaks of his opportunity to preach the gospel as if it were a door through which he was allowed to walk. This can be stated in active form. Alternate translation: "The Lord opened a door to me ... to preach the gospel" or "The Lord gave me the opportunity ... to preach the gospel" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-activepassive]])