Life without a design is erratic. As soon as one is in place, principles become necessary. I think you'll concede that nothing is more shameful than uncertain and wavering conduct, and beating a cowardly retreat. This will happen in all our affairs unless we remove the faults that seize and detain our spirits, preventing them from pushing forward and making an all-out effort.
—Seneca, Moral Letters, 95.46(resource) The Daily Stoic: 366 Meditations on Wisdom