Sabr is the only action which Allah has promised that He will recompense without any measure. The reward of sabr is limitless. Meaning that all of the other actions have a fixed reward, but not Sabr. This is the one action which has no fixed reward. That shows how great and tremendous is the recompense. Just imagine then the bounties and the pleasures that await you in this world and especially in the Hereafter because of your patience.
When the time gets tough remind yourself of how pleased Allah is with Sabr. Remember that Sabr comes from Him. So ask Him to pour down upon you Sabr. Lesson learned from Surah Az-Zumar:
“… those who patiently persevere (al-sabiruna) will truly receive a reward without measure” (39:10).