WordNet (r) 3.0 (2006):

see the light
    v 1: change for the better; "The lazy student promised to
         reform"; "the habitual cheater finally saw the light" [syn:
         reform, straighten out, see the light]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "see the light":
   appear, arise, awake, awaken, be begotten, be born, be incarnated,
   become manifest, become public, become visible, break, buzz about,
   circulate, come, come alive, come forth, come forward,
   come in sight, come into being, come into existence, come out,
   come to, come to hand, come to life, come to light, crop out,
   descry, discern, emerge, enter, fade in, find vent, fly about,
   get about, get abroad, get afloat, get around, get exposure,
   go about, go forth, go the rounds, have currency, heave in sight,
   issue, issue forth, live again, look forth, loom, make out,
   materialize, outcrop, peep out, penetrate, perceive, pierce, plumb,
   quicken, reanimate, rear its head, resurge, resuscitate,
   return to life, revive, rise, rise again, see, see daylight,
   see into, see through, show, show up, spread, spread about,
   spread like wildfire, stream forth, strike the eye, turn up