Psalms 136:4

To him who alone doeth great wonders - Miracles; marvelous things; things which spring from his direct and absolute power; things lying beyond the range of natural laws. See the notes at Psalms 72:18.

For his mercy ... - For all these mighty wonders are performed in carrying out purposes of mercy. So the wonders which were done in Egypt were for the deliverance of an oppressed people; so the miracles performed by the Saviour and his apostles were to remove disease and pain, and to establish a religion of mercy; so the divine interpositions among the nations are to assert the principles of righteousness, to secure the reign of order and love, and to promote the welfare of mankind.