To me, these statements seem to be raw material intended for elaborate explanations that have not survived.
Schweitzer tried to separate factual history about Jesus from the systematic theology that informed the invention and re-invention of Christian religions.
Tolstoy took a more Orthodox approach (though he was branded a heretic by the Russian Orthodox church at the time), focused on the beatitudes and wrote "The Kingdom of God is within you."
Reminds me of some of the quotes. I need organizational and explanatory help before I buy in to any interpretation, and I'm very suspicious of the analyses I'm reading.