A sound heart is a surer guide than an ill-trained conscience. Auteur: Mark Twain Copy Quote More from Mark Twain “All you need in this life is ignorance and confidence; then success is sure. ” “Drag your thoughts awayfrom your troubles...by the ears, by the heels,or any ot…” “All ideas are second-hand, consciously and unconsciously drawn from a million o…” “I am not interested to know whether vivisection produces results that are profi…”