What's the meaning of "steal" in There Is A Pleasure In The Pathless Woods?

There is a pleasure in the pathless woods,
There is a rapture on the lonely shore,
There is society, where none intrudes,
By the deep sea, and music in its roar:
I love not man the less, but Nature more,
From these our interviews, in which I steal
From all I may be, or have been before,
To mingle with the Universe, and feel
What I can never express, yet cannot all conceal.

I don’t understand the line "From these our interviews, in which I steal."