Arabic
اَللّٰهُمَّ لَا سَهْلَ إِلَّا مَا جَعَلْتَهُ سَهْلًا، وَأَنْتَ تَجْعَلُ الْحَزْنَ إِذَا شِئْتَ سَهْلًا
Meaning
O Allah, nothing is easy except what You make easy, and You make the difficult easy if You will.
Source
HadithIbn Hibban, Sahih 974; Ibn al-Sunni, 'Amal al-Yawm 351