The definition of the soul is, spiritual or immaterial part of a human being or animal, regarded as immortal.
It is the soul you recognize when you are at ease.
There are so many cliche' on how to reach that state of connection and it might work if you could get rid of a little bit sarcasm and ego (right there I created a new one).
During my training my favorite one was the scariest one. If today was your last day. I can't really say I answer that, but I ask it everyday.
It is the mind that scans my life and in that moment is choosing to see the beauty. Recognition of the soul and its liberation can be senses, even if not at its fullness.