I perhaps ought to have included in my list, also, Yagyu Munenori, 1571-1646, the great swordsman and philosopher (whose father-in-law and possibly son were, by the way, Iga ninja). His thought on war and Buddhism is also extremely applicable to Christian ethics, and he is the only reason I have even a smidgen of understanding of Zen. If you want to know what the Mind of No Mind is, read Munenori, not Bruce Lee (here’s a hint: it’s not “Don’t think, feel.”)
His book also has wonderful Zen one-liners, as, for instance, “We ought to cast away the Law. How much more, then, ought we to cast away the false law?”