Citations about self-reflection from religious texts 
(in alphabetical order by the name of the religion)

The faults of others we see easily; our own are very difficult to see. Our neighbor's faults we winnow eagerly, as chaff from grain; our own we hide away as a cheat hides a losing roll of the dice. --- Buddhism

 

First take the log out of your own eye, and then you will see clearly to take the speck out of your brother's eye. --- Christianity

 

If you love others, and affection is not returned, look unto your love. If you rule others, and they are unruly, look into your wisdom. If you treat others politely and they do not return your politeness, look into your respect. If your desires are not fulfilled by what you do, turn inward and examine yourself in every point. --- Confucianism

 

The ignorant observe others' faults, be they so little as a mustard seed. They overlook their own faults as large as bilva fruits. --- Hinduism

 

They who quarrel with others, instead of quarreling with their own hearts, waste their lives. --- Sikhism

 

He who knows others is discerning; he who knows himself is wise. --- Taoism

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From the book, Oneness: Great Principles Shared by All Religions, by Jeffrey Moses