Here is an example:
Jesus said, "Take, eat this is my body" Mt.14.22
If any man eat of this bread, he shall live forever; and the bread that I will give is my flesh,for the life of the wordl. Jn.6.51
Except ye eat the flesh of the Son of Man and drink his blood, ye have no life within you." Jn. 6.53
St Paul wrote, "The cup we bless..is a participation with the blood of Christ...the bread we break is a participation in the Body of Christ."
The cards have already been blessed at Mass. They're sacramentals--not just pretty greeting cards!
To do Holy Card Evangelism you buy the holy cards and hand them out like Protestants do gospel tracts.
At the supermarket check out you just smile and say to the person helping, "Would you like one of these prayer cards? It's a reminder that Jesus loves you and I'm praying for you" or "Why not take one of these nice prayer cards? God bless you!"
Or maybe you leave it at the restaurant with your tip (but you better leave a good tip!)
This can be your way of "Taking something up for Lent."
Father Longenecker has cards available if you would like to purchase some, and no this is not a Catholic sell. At the price of .20 per card, he is definitely not making any money off this venture. He just wants Catholics to be more forthright in promoting their faith. What a good idea!
Check it out at Standing on My Head