Meditation

Meditation is medication for the mind. By being still and taking time each day helps in centering our mind, give our brain a rest, strengthen our minds to aid in control of  our automatic emotional response.

Taking the time to get in between our thoughts helps calm and clear the mind. Along with breath work.
Regular practice help to keep your mind healthy, lower blood pressure as well.
I learned when I asked Deepak Chopra what is the difference between prayer and meditation.
Necessary.
Prayer is talking with God and meditation is listening.
Many different ways types of meditation. 

Guided meditation is a great place to start and easier for everyone and anyone to do as you don't have to stress about clearing and they give you something to concentrate on. 

Meditation is concentration.