Concentrate on what you can control

You can’t change everything, but you can always change something. Wasting your time, talent and emotional energy on things that are beyond your control brings frustration and misery. Invest your energy in the things you can control, and act on them now.

Source: 30 Things to Start Doing for Yourself @ Marc and Angel Hack Life: Practical Tips for Productive Living

image: Minack_015 by EmPemm under Creative Commons license