Those who strive with Yahweh shall be broken to pieces; Against them will he thunder in the sky: Yahweh will judge the ends of the earth; He will give strength to his king, Exalt the horn of his anointed.
The motif of God making the barren fertile in response to their trust and obedience runs through the rest of 1 and 2 Samuel (cf. Samuel). So does the corollary truth that God will make the "powerful," who are not trusting and obedient, infertile and ultimately dead (cf. Saul). Likewise the motif of the Lord’s anointed king is a major one in 1 and 2 Samuel (cf. David). Thus this prayer prepares the reader for the rest of the book.