NFs, young or old, male or female, cannot shake off their intuitive understanding that existence is bittersweet, with defeat the other side of triumph-that, in the midst of happiness, sadness but awaits its turn.
- David Keirsey, Please Understand Me II
INFPs present a calm, pleasant face to the world and are seen as reticent and even shy. Although they demonstrate a cool reserve toward others, inside they are anything but distant. They have a capacity for caring which is not always found in other types.
- David Keirsey & Marilyn Bates, Please Understand Me