It is not uncommon to see laborers who are so poor that whatever they earn on any given day is spent on that same day. Yet many of them are happy, peaceful, with strong hearts and tranquil souls. This is because they are too busy to think about yesterday or tomorrow.
Their life-style has given them an appreciation of today since they have not been afforded the opportunity of thinking about anything else.
Compare these to those who live in mansions. Inactivity and free time have afforded them with plentiful time to think about their problems and their lack of purpose in life. Thus misery and worry afflict many of them day and night.