It is one thing to show a man that he is in an error, and another to put him in possession of truth. -Locke
Proverbs 27:6 Faithful are the wounds of a friend; but the kisses of an enemy are deceitful.
How do determine the value of friends? Obviously those who fail to candidly tell you about myself (out of love) should have little value or, impact in your life. Friendship is not based upon someone always agreeing with you, but rather one willing to risk losing the friendship by giving you advice that could keep you from going over the ledge.