>>"I need no warrant for being, and no word of sanction upon my being. I am the warrant and the sanction."

How about John Donne's "No man is an island?" (you may recognize another famous misquotation as well:)

No man is an island,
Entire of itself,
Every man is a piece of the continent,
A part of the main.
If a clod be washed away by the sea,
Europe is the less.
As well as if a promontory were.
As well as if a manor of thy friend's
Or of thine own were:
Any man's death diminishes me,
Because I am involved in mankind,
And therefore never send to know for whom the bell tolls;
It tolls for thee.