Charles H. Spurgeon on Psalms 60:6

God hath spoken in his holiness. That is, he hath given out his word from heaven, the habitation of his holiness and of his glory; or, he hath spoken it certainly, there is nothing but holiness in his word (and that is the strength of words). David having received this word stands assured, that as Shechem and Succoth, Gilead and Manasseh, Ephraim and Judah would willingly submit to him and yield obedience; so, also, that Moab, Edom, and Philistia, who were his professed enemies, should be subdued to him. He expected to conquer and triumph over them, to put them to the basest offices, as his vassals, because God had decreed and spoken it in his holiness. God hath spoken the word, saith he, therefore is shall be done, yea, it is done; and therefore David cried, All's mine, Gilead in mine, Manasseh is mine, Moab and Edom are mine, as soon as God had spoken the word. Joseph Caryl.