Abu Ad-Dardaa [radiyallaahu-anhu] said:

Supplicate to Allaah in your times of ease and He will answer your supplication in your times of difficulty.”  A man said to him, ‘’Advise me.” So he said to him, ‘’Remember Allaah in times of ease and He [The Mighty and Majestic] will remember you when you are in difficulty.”

[Jaami-ul Uloom Wal-Hikam: page:203]