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.