Baha'u'llah says in the Hidden Words:-- O Son of Being! How couldst thou forge thine own faults and busy thyself with the faults of others?
Whoso doeth this is accursed of Me.
O Emigrants! The tongue I have designed for the mention of Me, defile it not with detraction.

If the fire of self overcome you, remember your own faults and not the faults of My creatures, inasmuch as every one of you knoweth his own self better than he knoweth others.
'Abdu'l-Baha says:-- Let your life be an emanation of the Kingdom of Christ.

He came not to be ministered unto, but to minister....

In the religion of Baha'u'llah all are servants and maidservants, brothers and sisters.

As soon as one feels a little better than, a little superior to, the rest, he is in a dangerous position, and unless he casts away the seed of such an evil thought, he is not a fit instrument for the service of the Kingdom.
Dissatisfaction with oneself is a sign of progress.