Judy Keane says:
"Therefore, never underestimate the impact of your warm smile, a kind word of support, a compassionate touch, a heartfelt compliment, a listening ear or a warm greeting. Be aware of those who might be hurting around you – perhaps the person at the check out counter, someone you work with, someone sitting next to you on a plane. Why? Doing good is powerful! It has a ripple effect. It directly counteracts the evil of our times. It has the power to transform hearts, minds and souls. It transforms and uplifts ourselves and others – making extraordinary things happen. Above all it is pleasing to God for as Saint Faustina says, “Pure love … knows that only one thing is needed to please God: to do even the smallest things out of great love – love, and always love,” – Divine Mercy in My Soul.
So throughout each day let us look for opportunities to do good. If ever the world has need of massive amounts of good deeds – it is now!"
See
http://catholicexchange.com/the-power-of-doing-good