Prayers and Meditations — Paragraph 437
Source (Arabic)
أَنْتَ المُقْتَدِرُ عَلَى ما تَشَاءُ لا إِلهَ إِلاَّ أَنْتَ العَزِيزُ المُسْتَعَانُ.
Translation
Potent art Thou to do Thy pleasure. No God is there but Thee, the Most Powerful, He Whose help is implored by all men.