Riyad-us-Saliheen 101
Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (PBUH) said. "The (Hell) Fire is surrounded with all kinds of desires and passions, while Jannah is surrounded with adversities."
[Al-Bukhari and Muslim]
The way to Hell is littered with these evils. When a person crosses them, it is an indication that he has entered into Hell. On the other side exists a series of griefs and calamities, Islamic injunctions and obligations (the compliance with which is often irksome for man) impede his way to Jannah. When a person endures them with patience he, in fact, overcomes those obstacles and becomes eligible for Jannah.