What is meant by ?killing of conscience??

He who is pure in thought, speech and action, who fears sin and Adharma, who is pious,
God-fearing and equanimous, who is balanced and capable of maintaining equilibrium, will have
his conscience in an unblemished state. He who has abundant Sattva (quality of purity) will
always have an unmarred conscience. Expansion of heart gives rise to the hearing of the voice of
conscience. Inner guidance will always be to that individual who has Sattva in abundant measure
by way of Japa, Svadhyaya, Pranaya… http://bit.ly/djbt2s