Give your best at work. Do more than what is required. Make people (customers or stakeholders) happy.

But right after that, draw a line and set your boundaries. Get some rest, invest your time with your family, or make time for your health. Don't let "anxious toil" drive your everyday life. 

Yes, there will always be more work to do tomorrow. But God also gives rest to his loved ones and faithfully provides even when you are asleep. 

Let go of your guilt – take your rest. Tomorrow, you'll get a new day to give your best.