Piper on prophecy

A personal anecdote by John Piper:

Or under this definition of the gift of prophecy it was probably the gift of prophecy last Sunday when I pointed to downtown Minneapolis and said (apart from what was in my notes), “A Bible study on the 36th floor of the IDS Tower with well-to-do business men is not mercy ministry, but it is crucial and valuable and necessary.” A woman came up to me after that service with joy in her face saying that she was visiting this morning and just that week had had a meeting with well-to-do businessmen on the 36th floor of the IDS tower about a ministry possibility and she came hoping for encouragement in the venture. She took it as an encouragement from the Lord. 

http://www.desiringgod.org/messages/using-our-gifts-in-proportion-to-our-faith-part-1