How to use "conscience" in a sentence

With a good conscience our only sure reward, with history the final judge of our deeds, let us go forth to lead the land we love, asking His blessing and His help, but knowing that here on earth God's work must truly be our own.

"Remember maybe ten years ago when that Texas elections official revealed how Lyndon Johnson's first local election was fixed? The guy said he was just trying to clear his conscience after all those years

"Well, if someone had a guilty conscience, why wouldn't he approach you directly?"

Now George Alexander was the Nevada bureau chief of the nation's first truly secret police force - a fact that apparently did not weigh heavily on his liberal conscience.