I'm working on a series of devotionals on the attributes of God, for a summer missions group. I came upon a few good quotes concerning God's omnipotence, his being all-powerful:
"The power of God is that ability and strength whereby He can bring to pass whatsoever He pleases, whatsoever His infinite wisdom may direct, and whatsoever the infinite purity of His will may resolve . . . As holiness is the beauty of all God’s attributes, so power is that which gives life and action to all the perfections of the Divine nature. How vain would be the eternal counsels, if power did not step in to execute them. Without power His mercy would be but feeble pity, His promises an empty sound, His threatenings a mere scare-crow. God’s power is like Himself: infinite, eternal, incomprehensible; it can neither be checked, restrained, nor frustrated by the creature." (Stephen Charnock).
“But seeing that He is clothed with omnipotence, no prayer is too hard for Him to answer, no need too great for Him to supply, no passion too strong for Him to subdue, no temptation too powerful for Him to deliver from, no misery too deep for Him to relieve.” (A. W. Pink)
“My faith has no bed to sleep upon but omnipotence.” (Samuel Rutherford)