Translation of the verse 20 from Surah Al-Jathiyah : Number of verses 37 - - page 500 - Part 25.
This (Quran) is a clear insight and evidence for mankind, and a guidance and a mercy for people who have Faith with certainty.
This [Qur'an] is enlightenment for mankind and guidance and mercy for a people who are certain [in faith].
(45:20) These are the lights of discernment for people and guidance and mercy for those endowed with sure faith. *25
*25) That is, "This Book and this Shari`ah present such a light for all the people of the world, which distinguishes the truth from falsehood, but only such people receive any guidance from it who believe in its truth; for them only it is a mercy. "