和人爭論，首要問題是有沒有意義。如果費勁半天，徒糜口水，就沒有意義了。新約馬修里說：不要把神聖的餵狗。我們短暫而寶貴的生命，千萬不能浪費在餵狗上。
Do not give what is holy to dogs; and do not throw your pearls before swine, or they will trample them under foot and turn and maul you.
