Commentaries:
Barnes' Notes
My goodness - Margin, "my mercy." That is, He shows me mercy or favor. All the favors that I receive come from him.
And my fortress; my high tower, and my deliverer - See the notes at Psalms 18:2, where the same words occur.
My shield - The same word which in Psalms 18:2 is rendered "buckler." See the notes at that passage.
And he in whom I trust - The same idea as in Psalms 18:2. The tense of the verb only is varied.
Who subdueth my people under me - See the notes at Psalms 18:47. The language is slightly different, but the idea is the same. It is to be remarked that David "here" refers to his people - "who subdueth my people," meaning that those over whom God had placed him had been made submissive by the divine power.
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