If you cannot accomplish everything you set out to do today, at least do some of it.
It is far better to make small, incremental steps of progress than to make no progress at all.
Do not use an all or nothing attitude as an excuse to do nothing.
Do something, no matter how small, to work toward your goals every day.
When you do not have the time, energy, or resources to do a lot, do a little, but do something.
Over time you will notice that all of your small steps forward have taken you farther than you imagined.
Some progress is infinitely better than perfection when perfectionism keeps you from making progress.