Doom comes about because of neglecting to evaluate one's self and because of just following one's whims.
Ibn Qayyim Al-JawziyyaWhoever mocks his brother for a sin they repented from will not die till he himself falls into the same sin.
Ibn Qayyim Al-JawziyyaLosing time is harder than death, as losing time keeps you away from Allah and the Hereafter, while death keeps you away from the worldly life and people.
Ibn Qayyim Al-JawziyyaThere are no means of attaining faith and certainty except through the Qur'an.
Ibn Qayyim Al-JawziyyaThe ibtilaa' (testing) of the believer is like medicine for him. It cures him from illness. Had the illness remained it would destroy him or diminish his reward and level (in the hereafter). The tests and the trials extract these illnesses from him and prepare him for the perfect reward and the highest of degrees (in the life to come).
Ibn Qayyim Al-Jawziyya