An excellent rule

To recognise one’s weaknesses and false movements and draw back from them is the way towards liberation.

Not to judge anyone but oneself until one can see things from a calm mind and a calm vital is an excellent rule. Also, do not allow your mind to form hasty impressions on the strength of some outward appearance, nor your vital to act upon them.

There is a place in the inner being where one can always remain calm and from there look with poise and judgment on the perturbations of the surface consciousness and act upon it to change it. If you can learn to live in that calm of the inner being, you will have found your stable basis.

Ref : Letters on Yoga Vol. III