Salt is good: but if the salt has lost its taste, how shall it be restored? It is neither fit for the land, nor yet for the dung hill; but men cast it out. He that has ears to hear, let him hear. Luke 14:34-35
Related to this truth: Character is the most important thing. It is Christ-likeness. Now, if we compromise our character we begin to redefine what character is. If we continue to compromise then we will eventually have no concept, even, of what Godly character is, and evil will be considered good. Such a person is salt which has lost its taste, and will be cast out.
Ian Vincent 
April 25, 2014 at 12:57 am
And there went great multitudes with him: and he turned, and said unto them, If any man come to me, and hate not his father, and mother, and wife, and children, and brothers, and sisters, yea, and his own life also, he cannot be my disciple. And whosoever does not bear his cross, and come after me, cannot be my disciple. For which of you, intending to build a tower, sits not down first, and counts the cost, whether he has enough to finish it? Lest perhaps, after he has laid the foundation, and is not able to finish it, all that behold it begin to mock him, Saying, This man began to build, and was not able to finish. Or what king, going to make war against another king, sits not down first, and consults whether he is able with ten thousand to meet him that comes against him with twenty thousand? Or else, while the other is yet a great way off, he sends a delegation, and desires conditions of peace. So likewise, whosoever he be of you that forsakes not all that he has, he cannot be my disciple. Salt is good: but if the salt has lost its taste, how shall it be restored? It is neither fit for the land, nor yet for the dung hill; but men cast it out. He that has ears to hear, let him hear.
(Luke 14:25-35)