'Thou shalt not kill' does not apply to murder of one's own kind only, but to all living beings and this commandment was inscribed in the human breast long before it was proclaimed from Sinai.
I sing, not arms and the hero, but the philosophic man: he who seeks in contemplation to discover the inner will of the world, ininvention to discover the means of fulfilling that will, and in action to do that will by the so-discovered means.
We often confuse spiritual knowledge with spiritual attainment. Spirituality is not a matter of knowing scriptures and engaging in philosophical discussions. It is a matter of heart culture, of unmeasurable strength.