You are remarkably eloquent in a 2nd tongue. You write with more grace, suppleness and humor than many people for whom english is mother tongue.
And your "oneness with everything" thoughts are spot on. What you said reminds me of one of the central points in the book Zen in the Art of Archery, which was one of my early influential "non-swimming" books. (In the past 15 or more years all my most influential books were on topics other than swimming.)
The book says that the object of practice is to make a physical activity effortless both mentally and physically, until the body can execute complex movements without conscious control from the mind. At the highest level of skill we become egoless and non-self-conscious.
Head Coach & Chief Executive Optimist
May your laps be as happy as mine.
My TI Story