Self Control.

"Those who do not follow the Yogas of love, knowledge, or work, as taught by me, but pursue instead the path of the worldly and seek to gratify their selfish desires through their restless senses-verily do those tread the round of birth and death.
One must be pure in heart to enter into the life of the spirit and follow the Yogas. To achieve purity of heart one must observe cleanliness, practise austerities, be compassionate towards all beings, and perform the appropriate duties of life. Work becomes consecrated and purifying when it is done as a service unto me.
Detach yourself from the objects of desire. Abstain from wordly pleasures that you may thus free yourself from the entanglement of the senses. This is the righteous conduct that leads one to the highest good, and frees man from greef, infatuation and fear.
By attributing worth to tangible objects, man becomes attracted to them; attraction to them brings desire for them; desire leads to competition and dispute amongst men. These rouse violent anger, and the result is delusion. Delusion completely overcomes man's sense of right and wrong.
When a man loses the sense of right and wrong, he lives in vain. For he lives steeped in dense darkness and misses the purpose of life. Engrossed in things of the world, knowing neither himself nor the supreme Self, he becomes an automation and knows not what he does.
Verily is the Universe come out of me, and I dwell in the hearts of all beings. But deluded souls, who are steeped in worldliness and seek only to gratify their senses, know me not. Blinded are they by the fog of ignorance."

-- excerpts from the Lord's discourse to Uddhava(Srimad Bhagavatam)