There 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-JawziyyaThere are six stages to knowledge: Firstly: Asking questions in a good manner. Secondly: Remaining quiet and listening attentively. Thirdly: Understanding well. Fourthly: Memorising. Fifthly: Teaching. Sixthly- and it is its fruit: Acting upon the knowledge and keeping to its limits.
Ibn Qayyim Al-JawziyyaIf a man's patience is stronger than his whims and desires, then he is like an angel, but if his whims and desires are stronger than his patience, then he is like a devil. If his desire for food, drink and sex is stronger than his patience, then he is no better than an animal.
Ibn Qayyim Al-Jawziyya