Have faith in your heart and mind; Be honest with yourself about your beliefs; Express your belief outwardly or verbally when possible.

This hadith speaks to the importance of having faith in one's heart and mind. It is narrated on the authority of Abu Huraira that some people from amongst the Companions of the Prophet came to him and said that they perceived something in their minds which was too grave for them to express. The Prophet asked if they really perceived it, and upon their confirmation, he remarked that this was a manifestation of faith. This hadith teaches us that having faith in our hearts is an important part of being a Muslim, even if we cannot express it outwardly or verbally. It also shows us how important it is for us to be honest with ourselves about our beliefs so we can grow closer to Allah SWT through our faith.