Autobiography of St. Teresa of Avila (Dover Books on Western Philosophy) by St. Teresa of Avila. Save 22 Off!. $8.58. Publication: July 21, 2010. Publisher: Dover Publications (July 21, 2010). Series - Dover Books on Western Philosophy
(I believe this is a paraphrase of Merton--need to factcheck reference) I'd add that if the you of today doesn't cringe at the mission work you were doing five years ago, you aren't growing missiologically.