In his book “Renew Your Life,” pastor Kai Mark Nilsen suggests a wonderful Christian mindfulness exercise based on the Prayer of St. Francis of Assisi.

The prayer goes:

Make me an instrument of your peace.
Where there is hatred, let me sow love. 
Where there is injury, pardon.
Where there is doubt, faith.
Where there is despair, hope.
Where there is darkness, light.
Where there is sadness, joy.

O Divine Master, grant that I may not seek
So much to be consoled as to console,
To be understood as to understand,
To be loved as to love with all my soul.

For it is in giving that we receiving.
It is in pardoning that we are pardoned.
It is in dying that we are born to eternal life. 

Nilsen suggests taking a verse a day and using it to apply to your behavior in your relationships. How can you sow light in the darkness with the people you meet today? How can you sow hope?

Additional resources are recommended here.