Here is another attempt with Arabic calligraphy. It seems to be one of the more famous ones on the internet and can be found on stock photography sites and as a wall tattoo. I found it originally on a book of “Prayers in Islam”. It is based on a calligraphy from 1864 in Iran.

540104 Kalligrafie * Arabic Calligraphy2

The translation is

Lord, make it easy
& don’t make it difficult.
– Lord, make it end well.