This is not a Cause

This is not a Cause which may be made a plaything for your idle fancies, nor is it a field for the foolish and faint of heart. By God, this is the arena of insight and detachment, of vision and upliftment, where none may spur on their chargers save the valiant horsemen of the Merciful, who have severed all attachment to the world of being. These, truly, are they that render God victorious on earth, and are the dawning-places of His sovereign might amidst mankind.

The Kitáb-i-Aqdas
www.bahai.org/r/469846513