One of the great devotees having been asked about his opinion concerning a hermit whom others had censured in their conversation, he replied: ‘I do not see any external blemishes on him and do not know of internal ones.’

Whomsoever thou seest in a religious habit
Consider him to be a religious and good man
And, if thou knowest not his internal condition,
What business has the muhtasib inside the house?

Saadi Shirazi

http://www.poemhunter.com/poem/ch-02-the-morals-of-dervishes-story-01/