I can attest to this when in the early 2000′s I changed my eye color from Green/Brown to just Green.  It took in total about 1 hour in about 2 weeks of thinking the thoughts.  I used a knowing confidence in doing it. I realize these days using love from the heart is actually much faster.

Dr Bruce Lipton, a scientist was one of the first people to bring this to the public’s attention.  Here is his video, it is a must view for those on a quest for the mind.