To live the best life is within the power of the soul, if it be indifferent to indifferent things. And it will be indifferent if it looks on all such things, severally and wholly, with discrimination; mindful that not one of them can impose upon us an opinion concerning itself, or can come of itself to us. Things stand motionless without; and it is we that form opinions about them within, and, as it were, write these opinions upon our hearts. We may avoid so writing them; or, if one has crept in unawares, we may instantly blot it out. 'Tis but for a short time that we shall need this vigilance, and then life will cease. For the rest, why should we hold this to be difficult? If it be according to Nature, rejoice in it, and it will become easy for you. If it be contrary to Nature, search out what suits your nature, and follow it diligently, even though it be attended with no glory; for every man will be forgiven for seeking his own proper good.