Being unthankful is always a sign that self is exalting itself above God. A selfless person can be content with very little. A self-centered person cannot be satisfied. Thankfulness is a sign of humility and cultivating a life of thankfulness will help keep "self" in its proper place.

Thankfulness to the Lord for what He is and what He has done is a very important part of the Christian life. One of the many benefits of thanksgiving and praise is that they keep us from being "self" oriented.

Giving thanks is a totally unselfish action and is a key to relationship with the Father that makes us "whole" and not just "healed."