As a bochur at a farbrengen I once heard a story of a Satmar bochur who went off the derech (r"l). Encountering a Lubavitcher bochur, the Lubavitcher told him that his performance of a mitzvah such as tefillin was something more precious to G-d then the deed of a person Shomer Torah V'mitzvos etc.
" 'My son,' the father said, 'you are always with me, and everything I have is yours. But we had to celebrate and be glad, because this brother of yours was dead and is alive again; he was lost and is found.'"
Great story (this was Wikipedia's rendition) . . . the source? The New Testament of course.
Yup - it turns out one of my favorite parables is the famed parable of the Prodigal Son.
(And yes the name of the post is over blown)
In a completely random and other note:
This almost made me cry last night