Those amongst us with good self discipline and the ability to sacrifice appear to fare well in life for themselves and others. Those individuals offer good modeling to those of us who want to increase our strength and ability to live well in life.
If you start life with these traits, they will come more naturally to you as you age, but if you didn't hone these traits early on, it may take some hard work to make them a regular part of daily living as an adult. Onward.