"O Allah, there is no ease except by that which you have made easy, and you are able to make to change difficulty into ease if you wish." [Sahih ibn Hibban]
"Qaddar Allahu masha'a fa'ala."
"Allah has decreed and He does what He wills." [Sahih Muslim]
"Hasbi Allahu wa ne'mal wakil."
"Allah is sufficient for me and is the best trustee of affairs."
[Recorded by Abu Dawud and authenticated by Shaykh al-Albani]"
Inna lillahi wa inna ilayhi raji'un."
"We belong to Allah, and surely to Him we shall return." [Al-Qur'an 2:156]
"Inna lillahi wa inna ilayhi raji'un. Allahumma ujurni fi musibati w'ukhluf li khayran minha."
"Truly to Allah we belong and verily to Him we shall return. O Allah, reward me in this calamity and compensate me with something better than it." [Sahih Muslim]
Likewise when one is in times of ease and relaxation he should thank Allah for his blessings and glorify and praise Him for the good that he was granted.