The true miskeen is the one who wasted his life learning that which he does not practice, thus he looses the pleasures of the dunyaa and the goodness of the akhirah, coming forth bankrupt (on the Day of Judgment) with strong evidences against himself.
Exposing a person’s fault becomes permissible under certain circumstances when done for a beneficial reason, and this does not amount to backbiting that person.
It is upon the students of knowledge to look into the positions of those who preceded them and then choose from them whatever conforms to the textual evidence.
This topic is serious and the duty of the knowledge seeker is also great and it varies according to the degree of knowledge he has, to the need of people for it and according to his ability and capacity.
So the callers to Allaah must start with knowledge. Whosoever calls to Allaah without knowledge, then such a person will cause greater harm than good – as is evident.
Imaam Sufyaan ath-Thawree related that as a youth, when he first began to attend formal Islamic classes, his mother advised him, “If you write down 10 words and your faith hasn’t improved, check your intentions.”