The moment of silence between sleeping and waking
A quiet mind is a virtue. There is a wonderful quote in the Meditations of Marcus Aurelius, a Stoic philosopher and virtuous Roman Emperor, that reminds me of the importance of attaining a quiet mind in this life.
Remember how you have been putting off these things, and how many times you have been given days of grace, and yet you do not use them. Now is it high time to perceive the kind of Universe whereof you are a part and from whom you subsist as an effluence, and that the term of your time is circumscribed, and that unless you use it to attain calm of mind, time will be gone and you will be gone and the opportunity to use it will not be yours again.