Charles H. Spurgeon on Psalms 86:6

Supplications ytwnwxt, deprecations. The Psalmist forms a peculiar Hebrew word, feminine plural, not found elsewhere, to convey more impressively the idea of suppliant weakness. —A.R. Fausset.

Verses 8-10. —There are two kinds of doubt which are wont in the hour of temptation to assail the soul: the doubt as to God's willingness, and the doubt as to God's power to succour. The first of these the Psalmist has already put from him; he now shows that he has overcome the second. God is able as well as willing to help, and every being on the face of the earth who receives help, receives it from the hand of Him who is the only God, and who shall one day be recognized (so speaks the strong prophetic hope within him, Ps 86:9) as the only God. —J.J.S. Perowne.

Verses 9-10. All nations shall worship before thee, because as King of Nations, thou art great, thy sovereignty absolute and incontestable, thy Majesty terrible and unsupportable, thy power universal and irresistible, thy riches vast and inexhaustible, thy dominion boundless and unquestionable; and for the proof of this, thou doest wondrous things, which all nations admire, and from whence they might easily infer that thou art God alone; not only none like thee, but none beside thee. —Matthew Henry.