This is such a beautiful song, whether you understand the language or not. I love it. But, it sort of makes me sad. I'm not sure why. I don't think the video is the greatest. If you want, watch the video and listen, or listen to the song with your eyes closed.
another of his songs, sung with Carole Samaha (a Lebanese singer) - Ya Rab (with English subtitles)
or go here for Ya Rab without English subtitles.