1 Praise ye the LORD. Praise the LORD, O my soul. 2 While I live will I praise the LORD: I will sing praises unto my God while I have any being. 3 Put not your trust in princes, nor in the son of man, in whom there is no help.
There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.
Verse 3 is very simple - God is reliable, man is not. So, put your trust in God. If you put your trust in people they will let to down.
I'm not sure of the timing of Psalm 146, but this is the thrust of the prophecy to all the kings of Israel who are forever allying with Assyria or Egypt or someone- and as Hezekiah and Josiah both found out, alliances are t what God, the protector of Israel, is interested in.
If you are wondering about the "son of man" reference, note that many other translations clarify it with an indefinite article - "put not you trust in a son of man". Like Greek, there is no indefinite article in Hebrew. (Hebrew has a definite article -the is Ha- but no "A") the son of man is not warranted here.