This brings me to another important point. As Christians we are all are called to help each other. With work, family, etc. it is at times difficult to engage in external works of charity. Prayer is the best thing we can do for people. When we do help people in other ways we should pray for them also.
Intercessory prayer is charity.
By praying for others we are being charitable toward them. It's a Spiritual Work of Mercy and one that's easy to do. We can pray anytime and anywhere. We can pray right now for someone we know who is in need. There are more frequent opportunities for prayer than for the Corporal Works of Mercy.