Where ego comes in, loving kindness departs. So wherever there is ego, there is very little space for true bliss and true happiness because true bliss and true happiness isn't exclusive to the attachments the ego enjoys playing with, but rather a free state of mind that is part of loving kindness and its activities inside and outside of oneself.
Trust what is not known to your Mind.
Trust what is known to your Heart.
The practice is simple. Whatever you're doing, do that with total awareness.