"Bless your fellow Jews and you’ll be blessed."
When you see a man in the street who looks like a frum Jew, you don’t have to go over to him. As you pass across the street, say, "Hashem should give that man success in parnassa (livelihood)! He should have nachas (pride) from his children! He should live long!"
It costs you money? It doesn’t cost you a penny! It’s such a good investment that you’re promised a bracha. — Ten Easy Ways to Gain Real Wealth (#93)