Psalms 86:10

"For You are great, and doing wondrous things: You alone are the great God" [Psalm 86:10]. Let no man call himself great. Some were to be who would call themselves great: against these it is said, "You alone are the great God." For what great thing is ascribed to God, when it is said that He alone is the great God? Who knows not that He is the great God? But because there were to be some who would call themselves great and make God little, against these it is said, "You alone are the great God." For what You say is fulfilled, not what those say who call themselves great. What has God said by His Spirit? "All nations." What says he, whoever he is, who calls himself great? "Far from it: God is not worshipped in all nations: all nations have perished, Africa alone remains." This you say, who callest yourself great: another thing He says who alone is the great God. What says He, who alone is the great God? "All nations." I see what the only great God has said: let man be silent, who is falsely great; great only in appearance, because he disdains to be small. Who disdains to be small? He who says this. Whoever will be great among you, said the Lord, shall be your servant. [Matthew 20:26] If that man had wished to be the servant of his brethren, he would not have separated them from their mother: but when he wishes to be great, and wishes not to be small, as would be for his welfare, God, who resists the proud, and gives grace to the humble, [James 4:6] because He alone is great, fulfills all things which He predicted, and contradicts those who blaspheme. For such persons blaspheme against Christ, who say that the Church has perished from the whole world, and is left only in Africa. […]

For thou art great,....

For thou art great. He had before said, "thou art good"; it is a grand thing when greatness and goodness are united; it is only in the Divine Being that either of them exists absolutely, and essentially. Happy is it for us that they both exist in the Lord to an equal degree. To be great and not good might lead to tyranny in the King, and for him to be good and not great might involve countless calamities upon his subjects from foreign foes, so that either alternative would be terrible; let the two be blended, and we have a monarch in whom the nation may rest and rejoice. And doest wondrous things. Being good, he is said to be ready to forgive: being great, he works wonders: we may blend the two, for there is no wonder so wonderful as the pardon of our transgressions. All that God does or makes has wonder in it; he breathes, and the wind is mystery; he speaks, and the thunder astounds us; even the commonest daisy is a marvel, and a pebble enshrines wisdom. Only to fools is anything which God has made uninteresting: the world is a world of wonders. Note that the verb doest is in the present, the Lord is doing wondrous things, they are transpiring before our eyes. Where are they? Look upon the bursting buds of spring or the maturing fruits of autumn, gaze on the sky or skim the sea, mark the results of providence and the victories of grace, everywhere at all times the great Thaumaturge stretches forth his rod of power. Thou art God alone. Alone wast thou God before thy creatures were; alone in godhead still art thou now that thou hast given life to throngs of beings; alone for ever shalt thou be, for none can ever rival thee. True religion makes no compromises, it does not admit Baal or Dagon to be a god; it is exclusive and monopolizing, claiming for Jehovah nothing less than all.

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.