If you can correctly pronounce every word in this poem, you will be speaking English better than 90% of the native English speakers in the world. After trying the verses, a Frenchman said he'd prefer six months of hard labour to reading six lines aloud. Try them yourself.
“Do not talk about things that do not concern you, and leave much of what does concern you. And do not argue with fools or clement people. Only mention your brother in ways that you would love to be mentioned.”—‘Abdullah ibn ‘Abbas(ra), paternal cousin of the Prophet(saw)