Psalms 86:10

Art - "Are"; second person singular.

For thou art great - Almighty, infinite, eternal.

And doest wondrous things - ועשה נפלאות veoseh niphlaoth; thou art the Worker of miracres. This thou hast done in numerous instances, and thereby showed thy infinite power and wisdom.

This appears to be a prophecy of the calling of the Gentiles to the faith of Christ, and the evidence to be given to his Divine mission by the miracles which he should work.

Thou art God alone - Συ ει ὁ Θεος μονος ὁ μεγας - Sept. Thou art the only, The Great God. In this the Ethiopic and Arabic agree.

For thou art great, and doest wondrous things - Things suited to excite wonder or admiration; things which lie beyond the power of any creature, and which could be performed by no one but a being of almighty power. A God who could do these things could also do that which the psalmist asked of him, for what God actually does proves that there is nothing within the limits of possibility which he cannot perform. The greatness and the power of God are reasons why we should appeal to him in our weakness, and in our times of trouble.

Thou art God alone - Thou only canst do what a God can do, or what belongs to God. In those things, therefore, which require the interposition of divine power our appeal must be to thee alone. So in the matter of salvation.