Who can utter the mighty deeds of the LORD, or declare all his praise? Blessed are they who observe justice, who do righteousness at all times!
This is the call of all the Lord's people. It is particularly vital for leaders to heed because the people best prepared to make a difference in uttering God's mighty deeds are leaders. Those who rise up to share in that duty are blessed to serve The Lord in gladness. It is a joy, a responsibility and ultimately a delight to do so.
This psalm mentions leaders at key points in Israel's growth. Moses and Aaron were Israel's great Exodus leaders, but they suffered at the mumbling indifference of the nation. Leadership is always tested. Don't lead if you don't think that you can handle that.
Phinehas was a leader of opportunity. When he saw how far Israel's idolatry had come into the camp, he stopped it single-handedly, dramatically and for the glory of God. And instanteous leaders like him are needed now as well.