What then? Is it possible to be completely without faults if you follow these rules? No, it's not possible. But this is possible: you can work constantly toward being faultless. We should be satisfied if we never stop paying attention and manage to avoid at least a few mistakes.
But when you say "Tomorrow I'll start paying attention," here's what you're really saying: "Today I'll be shameless, careless about time and place, and petty. Today I'll let others hurt me. Today I'll be angry and jealous." Look at how many harmful things you're allowing yourself to do.
If it's good to pay attention tomorrow, wouldn't it be better to do it today? If tomorrow it's in your interest to be careful, it's even more important today — so you'll be able to do it tomorrow too, and not put it off to the third day.
What then? is it possible to be free from faults (if you do all this)? It is not possible; but this is possible, to direct your efforts incessantly to being faultless. For we must be content if by never remitting this attention we shall escape at least a few errors. But now when you have said, Tomorrow I will begin to attend, you must be told that you are saying this, Today I will be shameless, disregardful of time and place, mean; it will be in the power of others to give me pain; today I will be passionate and envious. See how many evil things you are permitting yourself to do. If it is good to use attention tomorrow, how much better is it to do so today? if tomorrow it is in your interest to attend, much more is it today, that you may be able to do so tomorrow also, and may not defer it again to the third day.