Criticizing someone redemptively is a spiritual act of service. It is also something that needs to be thought through carefully before doing it. Often times we criticize not for the purpose of blessing and healing but for the purpose of venting anger. Likewise, receiving criticism well is a deeply spiritual act. Too often we are defensive and respond by lashing out, passively or directly, toward the one who wounded us. It's understandable. To be criticized hurts. No one likes it. Criticism strikes a blow to our pride. It also removes the pretense that we can make everyone happy.
David Powlison wrote an excellent article in CCEF's Journal of Biblical Counseling that I hope you will read.
Check it out HERE.