From an Augustine sermon on Mt 10:16:
When the Holy Gospel was read, Brethren, ye heard how our Lord Jesus Christ strengthened His Martyrs by His teaching, saying, "Behold, I send you forth as lambs in the midst of wolves." Now consider, my Brethren, what he does. If but one wolf come among many sheep, be they ever so many thousands, they will all be put to confusion by one wolf in the midst of them: and though all may not be torn, yet all are frightened. What manner of design is this then, what manner of counsel, what manner of power, not to let in a wolf amongst the sheep, but to send the sheep against the wolves! "I send you," saith He, "as sheep in the midst of wolves;" not to the neighbourhood of wolves, but "in the midst of wolves." There was then at that time a herd of wolves, and but few sheep. For when the many wolves killed the few sheep, the wolves were changed and became sheep.
O that we would hold as the standard of our love, not the sentiment from our greeting cards, but the steady-love full of grace and power from our Creator and Redeemer.