Judgemental thoughts

In the Sufi tradition it is suggested that our thoughts should pass through three gates. At the first gate, we ask of our thoughts, "Is it true?" If so, we let the thought pass through to the second gate where we ask, "Is it necessary or useful?" If this also is so, we let the thought continue to the third gate where we ask, "Is the thought rooted in love and kindness?" Judgemental thoughts, which are neither true, helpful, nor kind, falter at the gates.

Christina Feldman in "Shabala Sun"