I say to you, be fundamentally happy. Be at peace. Be tirelessly kind. Do not be "surprised" by anything, neither your physical fatigue nor your moral weakness. Always evoke and keep a "smile" on your face, a reflection of our Lord's smile, who wants to act through you, and therefore replace you more and more.
(Pierre Teilhard de Chardin SJ /1881–1955/, letter from the front, to his cousin, September 20, 1915;
quoted from the book Pierre Teilhard de Chardin, The Birth of Thought. Letters 1914–1919, 2021)
