Psalm 145:12 so that all people may know of your mighty acts and the glorious splendour of your kingdom.
Why should we say good things about our God? How else are people going to hear about God unless we talk about him?
We get to know of all the good things about God as we grow up with Him in our lives; that good news needs to be spread to other people so they will be encouraged to find out more for themselves.
There is no end to the good God has done for us all, so there should be no end to the good things we can tell others about God!