“Beware of skipping into a constant doubt about the proven principles [of Islam] in order to justify the validity of your wrong conduct and behavior, whereby you
(a) pursue ambiguities that you never took the time to analyze patiently and disprove
(b) place your trust in immature thoughts
(c) become allures by life’s pleasures and vanities, or
(d) resent the exploitation of religion by some people who use it for their personal interest [resulting in the weakening of your adherence to the proven principles of Islam].
The measure stick of truth is not people. Instead, people are measured by the truth.”
-an excerpt from Sayyid Ali al-Sistani’s letter to today’s youth.