The dictionary defines success simply — but unsuccessful people tend to measure it in money and material things, while successful people measure it in happiness, contentment, health, freedom, relationships, and contribution to society.
Failure is part of success, not its opposite. Staying contented but not satisfied keeps us grounded while we continue to grow — aligning our actions to our Purpose of Life, and setting rolling milestones along the way.
Nothing is more difficult, than being successful.