You don't know how to practice "abstinence in full action". However, you answer yourself: by taking action! The greatest sacrifice we can make, the greatest victory we can win over ourselves, is to overcome apathy, the tendency for weak effort. Christian activity itself detaches and connects us to our Lord. Do not engage in theoretical abstinence, start by dedicating yourself to fulfilling your often disagreeable task that is appointed to you by God. He will help you...
(Pierre Teilhard de Chardin SJ /1881–1955/, letter from the front, to a cousin, July 4, 1915;
quoted from the book Pierre Teilhard de Chardin, The Birth of Thinking. Letters 1914–1919, Malvern 2021)
