So, they take a walk. They take a walk out Christianity . . . Sunday Mass. That is, they leave at communion because have more important things to do. I have to admit, it does seem on first hearing that these Gospel passages demand too much of us. Jesus sets a high standard.
Nature is self-centered.
However, he is clearly warning us that following him does not mean reward in this life. That was called prosperity theology. He is asking us to take the long journey with him. Now, you might obtain a degree of happiness and peace in following Jesus ever more perfectly. Some of the saints who have embarked on a life-long journey of faith report that they find contentment and the real meaning of love.