http://bible.com/8/psa.105.1.amp O GIVE thanks unto the Lord, call upon His name, make known His doings among the peoples!
Living a thankful life is living a joy filled, peaceful life. Miserable, depressed, and cast down people tend to be blind to what they do have and the people around them.
Recognizing that everything good comes from God causes us to be thankful for His goodness and gives reason to call on Him for what we need.
As we do He is found faithful and we will have many reasons to testify of His goodness to others.