To do some good to every person one meets

Let each one of God's loved ones… do some good to every person whose path he crosseth, and be of some benefit to him. Let him improve the character of each and all, and reorient the minds of men. 

(‘Abdu'l-Baha, Selections from the Writings of Abdu'l-Baha)

"be a lesson for others."

By good deeds, pure lives, humility and meekness be a lesson for others. 

(‘Abdu’l-Baha, ‘Tablets of ‘Abdu’l-Baha’, vol. 1)

To remember one’s own faults and not the faults of others

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.  

(Baha'u'llah, ‘The Hidden Words of Baha’u’llah’)

“Love is the source of all the bestowals of God”

Love is the source of all the bestowals of God. Until love takes possession of the heart, no other divine bounty can be revealed in it. 

(‘Abdu’l-Baha, from a talk, New York, 14 April 1912; ‘The Promulgation of Universal Peace: Talks Delivered by 'Abdu'l-Bahá during His Visit to the United States and Canada in 1912’)