Psalm 40:9-10 --
I proclaim your salvation in the great assembly;
I do not seal my lips, Lord, as you know.
I do not hide your righteousness in my heart;
I speak of your faithfulness and your salvation.
I do not conceal your love and your faithfulness from the great assembly.
I proclaim...
I do not seal...
I do not hide...
I speak...
I do not conceal...
I think David is making a point here ;)