Tirukkural 312: Not Doing Evil

It is the determination of the spotless not to do evil, even in return, to those who have cherished enmity and done them evil.

Image of Satguru Sivaya Subramuniyaswami
Faithfulness in marriage means fidelity and much more. It includes mental faithfulness, non-flirtatiousness and modesty toward the opposite sex. A married man, for instance, should not hire a secretary who is more magnetic or more beautiful than his wife.
—Gurudeva