Seek knowledge, even as far as China.
اطلبوا العلم ولو في الصين

Politicians
Harun al-Rashid
Fifth Abbasid caliph (763-809). Founded Baghdad's House of Wisdom, traded ambassadors with Charlemagne, became the hero of One Thousand and One Nights — but his 803 Barmakid purge began the caliphate's disintegration.
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Source: ハディース(伝承)。ハールーン本人の発言として頻繁に引用されるが本来は預言者ムハンマドに帰せられるDisputed
Harun al-Rashid's Other Quotes
In the name of God, the Compassionate, the Merciful. From the Commander of the Faithful Harun al-Rashid to Nikephoros, dog of the Romans. You will not hear my reply — you will see it.
Cloud, rain wherever you please — your land tax will still find its way to me.
Take whatever time gives you, and do not mourn what slips away.