اللَّهُمَّ لَا سَهْلَ إِلَّا مَا جَعَلْتَهُ سَهْلًا وَأَنْتَ تَجْعَلُ الْحَزْنَ إِذَا شِئْتَ سَهْلًا
Transliteration
Allahumma la sahla illa ma ja'altahu sahlan wa anta taj'alul-hazna idha shi'ta sahla
English meaning
O Allah, nothing is easy except what You make easy, and You make the difficult, if You wish, easy.
When is it recited?
Recited when facing a difficult matter.
Source
Ibn Hibban, 2427; Ibn Sunni, 351