A beautiful illustration on argument by Peter Kreeft and Ronald K. Tacelli. Just found this while preparing a sermon about faith and reason. Enjoy!
“A good argument is effective partly because it is like a diamond. Like a diamond, its light is beautiful and reflects the light of day, of objective reality. Like a diamond, it cannot originate light, only reflect it from its source of reality. Like a diamond, it is precious. Like a diamond, it is hard, not easily cut, not easily refuted; it cuts through other, softer materials, refuting and conquering error.”
—Handbooks of Christian Apologetics, 16-17.