Because selflessness is difficult, you want some guidance or a teacher. Maybe when you are practicing with a good teacher, you will naturally not be so selfish. Why our teacher is so hard on us is because of our selfish attitude. Whenever he sees our selfish attitude, he may point it out--or he may be angry with it.
Gyokujun So-on Suzuki
--cuke.com/ig for links to the source of the photo. Excerpt from Shunryu Suzuki lecture 69-03-16 as found on shunryusuzuki.com, edited by PF. Go to instagram.com/cuke_archives for the Instagram version.