The best way to capture moments is to pay attention. This is how we cultivate mindfulness. Mindfulness means being awake. It means knowing what you are doing.
The instinct of self-deception in human beings makes them try to banish from their minds dangers of which at the bottom they are perfectly aware by declaring them nonexistent, and a warning such as mine against cheap optimism was bound to prove particularly unwelcome at a moment when a sumptuously laid supper was awaiting for us in the next room.