اللَّهُمَّ لَا سَهْلَ إِلَّا مَا جَعَلْتَهُ سَهْلًا، وَأَنْتَ تَجْعَلُ الْحَزْنَ إِذَا شِئْتَ سَهْلًا
Allahumma la sahla illa ma ja'altahu sahla, wa anta taj'alul-hazna idha shi'ta sahla
O Allah, rien n'est facile sauf ce que Tu as rendu facile, et Tu peux rendre ce qui est difficile facile si Tu le veux.
Recite when facing a difficult subject or task
This dua acknowledges that true ease comes from Allah alone, and He can make any difficulty easy.