Because we were created to “fear the true God and keep his commandments, for this is the whole obligation of man. ”
فَعَلَيْنَا إِذًا أَنْ نُدَاوِمَ عَلَى طَلَبِهِ فِي ٱلصَّلَاةِ لِكَيْ يَزْدَادَ فَرَحُنَا .‏