What is the way to overcome the soul's languor and the repeated commission of sins, and to restore hope in self-reformation after losing it?

Weariness and languor affect every seeker on the path of closeness to Allah. Therefore, whoever experiences this should strive for rectitude and moderation, and gently struggle against their self to dispel boredom and continue in worship. You will not taste the delight of obedience and the sweetness of worship except through struggle and perseverance. Satan is keen to mislead you, so be vigilant, and if you fall into sin, repent immediately, for "the one who repents from sin is like one who has no sin." Every worshiper has a time of activity and a time of languor, and the successful one is he whose languor does not cause him to abandon an obligation nor to commit a forbidden act.