“All mysteries which lead theory to mysticism find their rational solution in human practice and in the comprehension of this practice.”
“In war, theory is all right so far as general principles are concerned; but in reducing general principles to practice there will always be danger. Theory and practice are the axis about which the sphere of accomplishment revolves.”
“In theory, there is no difference between theory and practice. But in practice, there is.”
“For mysticism proper - as distinguished from philosophical theory or vague feeling or literary pleasure - is a practical thing, something more than a doctrine, a life.”
“The theory that holds "good blood" or "bad blood" as a moral-intellectual criterion , can lead to nothing but torrents of blood in practice.”
“Theory is the practice of the impotent.”