What you get by reaching your goals is not nearly so important as what you become by reaching them.

Hilary Hinton "Zig" Ziglar (1926–2012) American author, salesperson, motivational speaker

Biscuits, Fleas, and Pump Handles (1974)

Ziglar used multiple variations of this phrase. Also attributed to Goethe and Thoreau. For more discussion see here.