Want to know the three words that gladdens the heart of God?

Have you ever found yourself in a situation where someone thanks you for a little help shown to him/her? If yes,then you know how it feels to be appreciated for your good deeds.
  The good God has done wonders in our life,both the seen and unseen but most of us forget to appreciate him in Thanksgiving.
The three most important word we must say to our God everyday of our life no matter the situation we find ourself in is.