It needs a good deal of philosophy not to be mortified by the thought of persons who have voluntarily abandoned everything that for the most of us makes life worth living and are devoid of envy of what they have missed. I have never made up my mind whether they are fools or wise men.
Remember one very fundamental thing about life: Any experience that has not been lived will hang around you, will persist: "Finish me! Live me! Complete me!" There is an intrinsic quality in every experience that it tends and wants to be finished, completed. Once completed, it evaporates; incomplete, it persists, it tortures you, it haunts you, it attracts your attention. It says, "What are you going to do about me? I am still incomplete - fulfill me!"
When there is no mind, you are in yoga; when there is mind you are not in yoga. So you may do all the postures, but if the mind goes on functioning, if you go on thinking, you are not in yoga. Yoga is the state of no-mind. If you can be without the mind without doing any posture, you have become a perfect yogi. It has happened to many without doing any postures, and it has not happened to many who have been doing postures for many lives.