92:8-9 In contrast to the wicked who will perish (v. 7) the Lord will reign forever. He will cause His enemies to die.
92:10-11 Rather than defeating the writer (v. 9) the Lord made him stronger, as strong as the horn of a wild ox. He had also refreshed him and made him glad. Refreshment and joy are what anointing with oil represented in Israel. Verse 10b does not necessarily mean the writer was a king or a priest in Israel though he may have been. God had blessed him by allowing him to experience victory over his enemies rather than dying.
92:12-15 Palm trees produced tasty fruit so they symbolized fruitfulness. Cedars were not subject to decay so they stood for long life in the ancient Near Eastern mentality (cf. v. 7). Both types of trees were also beautiful and desirable. The writer likened the godly to these trees planted in the temple environs. They represent people who delight in drawing near to God. Such people praise God for His consistent righteousness. Because of His unwavering righteousness He is a sure foundation similar to a large rock on which people can build their lives (cf. Matt. 7:24-27).
Reflection on God's good acts and His righteous character gives His people optimism as we face life. We can see things in their proper perspective and go through life rejoicing.