"This earth will never be without those persons who will prove the universality of truth as disclosed by Allah,
- they may be well-known persons, openly & fearlessly declaring the things revealed to them or
- they may, under fear of harm, injury or deaths hide themselves from the public gaze and may carry on their mission privately so that the reasons proving the reality of truth as preached by religion and as demonstrated by His Prophet may not totally disappear.
How many are they and where could they be found? I swear by Allah that they are very few in number but their worth and their ranks before Allah are very high.
Through them Allah preserves His Guidance so that they, while departing, may hand over these truths to persons like themselves.
The knowledge which they have acquired has made them see the realities and visualize the truth and has instilled into them the spirit of faith and trust.
The duties which were decreed as hard and unbearable by them.
They feel happy in the company & association of things which frighten the ignorant & uneducated
They live in this world like everybody else but their souls soar to the heights of Divine Eminence.
They are media of Allah on this earth and they invite people towards Him.
How I love to meet them."
Sayyidina Ali (a.s) bin Abu Talib (a.s)
Ref: Nahjul Balagha [ Saying # 147 (part) ]