Have faith in Allah's power and mercy; Be hopeful and optimistic about your future; Take your dreams seriously if they are positive; Believe in divine guidance from Allah even when you're not expecting it.

The Prophet Muhammad (Peace Be Upon Him) was informing his followers that the only way to receive glad tidings of prophecy is through a good dream, or ru'ya in Arabic. A good dream is one that a Muslim sees or is seen about him. This hadith emphasizes the importance of having faith and believing in Allah's power and mercy, as He can send us messages through our dreams. It also encourages us to be hopeful and optimistic about our future, as we may receive divine guidance from Allah even when we are not expecting it. Furthermore, this hadith reminds us to be mindful of our dreams and take them seriously if they are positive, as they could contain important messages from Allah for us.