We develop self-discipline by exercising it, in much the same way as we build our muscles. Every time we follow through on a resolution, we liberate the force of willpower within. But each time we break our resolve not to indulge in sense pleasures, the muscle of self-control becomes emaciated.

The liberty to live our life’s fullest potential comes, not from indulgence, but from steely discipline. Only by subduing our lower instincts can we lift ourselves up.