Psalms 119:172

My tongue shall speak of thy word - It shall speak of it in the language of praise; it shall speak of it in making it known to others.

For all thy commandments are righteousness - I see this; I feel it; and, therefore, I will speak of it. My impression that thy commandments are all righteous is so deep, that I cannot but speak of them. I must vindicate them; I must praise thee for them.