Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you'll be a success.

The saying reverses a common modern assumption that achievement produces well-being. It argues instead that an inner condition—happiness understood as joy, purpose, or wholehearted engagement—precedes and enables what people call “success.” The final sentence grounds this in vocation: loving one’s work sustains effort, resilience, and ethical commitment, making outward accomplishment more likely and also redefining success as fidelity to meaningful activity rather than status or wealth. The sentiment aligns broadly with Schweitzer’s humanistic ethics and emphasis on purposeful service, even if the exact wording may be a later popular formulation.

1) “Success is not the key to happiness. Happiness is the key to success.”
2) “Happiness is the key to success. If you love what you are doing, you will be successful.”
3) “Success is not the key to happiness. If you love what you are doing, you will be successful.”