"In what way does a certain idea contribute to the improvement of the quality of our lives? Does it heal us? Does it liberate us? Does it bring harmony into our lives? Does it contribute to a sense of peace, assurance? Does it fill us with a sense of gratitude? Does it inspire us with wisdom and love? Does it make it possible for us to find the answers we need to the problems of daily living? If what we are learning has this effect, then it must be existentially valid.