A sound heart is a surer guide than an ill-trained conscience. Author: Mark Twain Copy Quote More from Mark Twain “Nature has no originality--I mean, no large ability in the matter of inventing …” “We recognize that there are no trivial occurrences in life if we get the right …” “Choosing not to read is like closing an open door to paradise” “Learning softeneth the heart and breedeth gentleness and charity.”