And my tongue shall speak of thy righteousness and of thy praise all the day long.
Thy righteousness - which is the ground of 'my righteousness,' or justification (Psalms 35:27). The Lord's inherent and infinite righteousness is magnified by His people's justification on the ground of His righteousness imputed to them (Isaiah 42:21; Isaiah 45:24-25).
And of thy praise all the day long. In this third promise of thanksgiving, as distinguished from the former two (Psalms 35:9; Psalms 35:18), there is the additional element of continuous and unceasing praise.