Historically, I think Fox rejected traditional water baptism (which he did quite vocally) because of the hypocrisy he saw in the established religion around him - essentially, he did not see evidence of a spiritual change occurring with the physical act. Quakers regard treat sacraments, particularly communion and baptism, as a personal and internal experience. Personally, I believe that the New Testament defines “baptizo” as a spiritual immersion as opposed to its mundane meaning in Mark 1:8: “I baptize you with water, but he will baptize you with the Holy Spirit.” (NIV). I attempt address the part of your question regarding authority below, but the short answer is that Quakers generally believe that authority comes from God alone.
Through the direction of the Holy Spirit. Quakers have attempted to replace the gap left by standardized doctrine with some writings, particularly
Faith and Practice which includes pointed questions referred to as “queries” (examples
here), but these are not binding and not really the same thing as doctrine. In practice, this has resulted in disagreements between groups and individuals - leading to
very frequent splits. “Quaker” is a very broad definition with regard to belief structure.
Yup, I figured it would be good to get the common ground established at the start.
Absolutely not. Christ himself was baptized in water simultaneously as with being baptized with the Holy Spirit. Various individuals in our meeting have chosen to be baptized with water, and their church community has always been supportive of this in my experience. I personally have never been baptized, in the sense of participating in a ritual involving water, but can testify that I am immersed in the Holy Spirit.
Cool! I think most of us could do with more quiet time with God, particularly in our lives where technology and its distractions are so pervasive.