“…I will not say the doctrine I have always taught, but the doctrine I should always have liked to teach. That is the idea of taking things with gratitude, and not taking things for granted.

Also sometimes quoted as, “When it comes to life, the critical thing is whether you take things for granted or take them with gratitude.

G.K. Chesterton

“The most lost of all days, is that in which we have not laughed

-Probably Nicolas Chamfort, from his original quote of “La plus perdue de toutes les journées est celle où l’on n’a pas ri.”
Often accredited to Charlie Chaplin, Steve Martin, or Groucho Marx