For a day in thy courts is better than a thousand; i.e. than any number of days elsewhere. It is difficult to trace any connection between these concluding verses. They appear to consist of distinct thoughts, which arise in the writer's mind, and are jotted down as they occur to him.
One is a thought of loyalty, which finds vent in a prayer for the king (Psalms 84:9). Another is a reflection of the main thought of the psalm, the incomparable blessedness of dwelling in God's house.
A third (Psalms 84:11, Psalms 84:12) is the joy and glory of perpetual communion with God and trust in God. See the remarks of Professor Cheyne. I had rather be a doorkeeper in the house of my God; literally, at the threshold; but the meaning is well expressed by the Authorized Version.
"Doorkeepers in the house of their God" was exactly what the Korahite Levites were (1 Chronicles 9:19; 1 Chronicles 26:1, 1 Chronicles 26:12-19). Than to dwell in the tents of wickedness. As their ancestor, Korah, had done (Numbers 16:26).