The believer is like a stranger. He does not become worried due to being insignificant in it (this life)

Bismillahir Rahmanir Rahim
In the name of Allah, the Most Beneficent, the Most Merciful

Al-Hasan (al-Basrî) said,

"The believer is like a stranger. He does not become worried due to being insignificant in it (this life), and he does not compete for honor in it. His condition is one and the people are in another condition. Whenever Allâh created آdam ('Alayhis Salâm), He made him and his wife reside in Paradise. Then he was put out of it, yet was promised to return to it, he and the righteous ones among his offspring. So the believer is always longing for his first homeland..."

[Translators Note: A large amount of Arabic poetry, due to the difficulty in translating it adequately, has been omitted.]

The Prophet sal Allahu alayhi wa'sallam said:
"The Muslim is a unique Ummah among the whole of mankind:
Their Land is ONE, their War is ONE, their Peace is ONE,
Their Honour is ONE and their Trust is ONE."
[Ahmad]