Volume 3, Book 40, Number 564 :
Narrated by Anas (radiallaahu `anhu)
The Prophet (sallallaahu `alayhi wasallam) decided to grant a portion of (the uncultivated land of) Bahrain to the Ansar. The Ansar said, “(We will not accept it) till you give a similar portion to our emigrant brothers (from Quraish).” He said, “(O Ansar!) You will soon see people giving preference to others, so remain patient till you meet me (on the Day of Resurrection).
“Allaah has made patience like a horse that never gets tired, an army that can never be defeated and a strong fortress that can never be breached. Patience and victory are twin brothers, for victory comes with patience, relief comes with distress and ease comes with hardship. Patience is of more help to the one who has it than men, as it helps without any need for equipment or numbers and its relationship to victory is like that of the head to the body.”
Patience is the foundation of the believer’s faith which has no other foundation. The one who has no patience has no faith, and if he has any, then it is only a little faith and it is very weak, and such a person worships Allaah as it were upon the edge (i.e. in doubt): if good befalls him, he is content therewith; but if a trial befalls him he turns back on his face (i.e. reverts to disbelief after embracing Islam). He loses both this world and the Hereafter (cf. al-Hajj 22:11). All he gets from them is a losing deal.
The best life is attained by the blessed through patience, and they rise to the highest degrees through their gratitude. So they fly on the wings of patience and gratitude to gardens of delight (i.e., Paradise). That is the bounty of Allaah that He bestows upon whomsoever He will, and Allaah is the Owner of Great Bounty. End quote from ‘Uddat al-Saabireen by Ibn al-Qayyim, p. 3-5.
‘Umar ibn ‘Abd al-‘Azeez (may Allaah be pleased with him) said: Allaah has not bestowed any blessing upon His slaves then taken it away and replaced it with patience, but what He has compensated them with is better than what He has taken away.
Taken from IslamQA.