The Two Causes of Fitnah

Imām Ibn Taimiyyah, may Allāh have mercy on him, said:

Fitnah [trials and tribulations] doesn’t occur except by leaving what Allāh has commanded, for indeed, He—glorified be He in His perfection—commanded truth, and He commanded patience. So fitnah [comes about] either from leaving the truth or from leaving patience.

Al-Istiqāmah, vol. 1, p. 39.