What did Prophet Muhammad (saw) say about doing good deeds even when they are difficult?
      Narrated 'Aisha:                          A woman from the tribe of Bani Asad was sitting with me and Allah's      Apostle (p.b.u.h) came to my house and said, "Who is this?" I said,      "(She is) So and so. She does not sleep at night because she is      engaged in prayer." The Prophet said disapprovingly: Do (good) deeds      which is within your capacity as Allah never gets tired of giving      rewards till you get tired of doing good deeds."