A clean conscience makes a soft pillow.
When you have no observers be afraid of yourself.
There is a difference between him who does no misdeeds because of his own conscience and him who is kept from wrongdoing because of the presence of others.
Conscience is the inner voice that tells you the IRS might check your return.
Two things fill my mind with ever increasing wonder and awe – the starry heavens above me and the moral law within me.
Don’t you see that that blessed conscience of yours is nothing but other people inside you?
An uneasy conscience is a hair in the mouth. Mark Twain (Samuel Clemens)
He will easily be content and at peace, whose conscience is pure.
Even when there is no law, there is conscience.
Conscience is a man’s compass.