Islam is true. There are four types of effort in Islam:
The effort of listening....Ta'illem
The effort of speaking...Da'wah (Tabligh)
The effort of thinking...Dhikr
The effort of asking...Du'a
Faith ripens through mujahadah, It is strengthened through Da'wah,
It spreads through migration and it is saved through discharging the rights of Allah's servants.
(Maulana Ahmad Laat Damat BARKATUHUM , Ijtima Bhopal)
Imam Zahabi recorded from Sayyidina Imran Bin Hussain (r.a) that the messenger of Allah, peace be upon him said:
" On the day of judgement, the ink which was used by a (true) scholar
to put religious knowledge and injunctions into writing, and the martyrs b lood shall be
weighed. The scholars ink however, shall turn out to be heavier than the bloo d of the martyr "
(Ma'ariful Quran 3/235)
Wa Alaykum Salam Wa Rahmatullah
(Taken with thanks from http://engagersindawah.blogspot.in/2012/06/effort-in-islam.html )