conceive quotes

Je pouvais prendre pour re'  gle ge  ne  rale, que les choses que nous concevons fort clairement et fort distinctement sont toutes vraies. I could take it as a general rule that whatever we conceive very clearly and very distinctly is true.

- Rene Descartes
  Discours de la me  thode (Discourse on Method), 4th discourse (translated by G E M  Anscombe and Peter Geach).