Do you not see the wealth of the land of the Persians ? Do you not remember the poverty of the land of the Arabs ? Do you not see how the crops in this land cover the earth ? If the holy war were not enjoined by Allah, we should still come and conquer this rich land and exchange the hunger of our deserts for the abundant eating which is now ours.

al-Walid, Khalid ibn
Another Quote

7 Habits of Highly Resilient People