Know someone lonely who no longer has their 'life long' partner, due to death or divorce, or someone who doesn't fit in well socially at your work or church? Give them a call for a chat and see how they're going. You could plan some conversation topics before hand to keep the conversation less stilted, like asking if they went to, or are planning on visiting, some church events, asking how their week was, of if they have any holidays planned in the future, if they'd like any lemons off your tree...etc