Bad company is like a nail driven into a post, which, after the first and second blow, may be drawn out with little difficulty; but being once driven up to the head, the pincers cannot take hold to draw it out, but which can only be done by the destruction of the wood.
Saint AugustineWhat is reprehensible is that while leading good lives themselves and abhorring those of wicked men, some, fearing to offend, shut their eyes to evil deeds instead of condemning them and pointing out their malice.
Saint Augustine