This verse from Psalm 35:28, "My tongue shall talk about your righteousness and about your praise all day long," expresses a commitment to continuous and vocal adoration of God. Here's a breakdown of what it means:

"My tongue shall talk about your righteousness...": This refers to actively and verbally proclaiming God's justice, fairness, and moral perfection. It's not just thinking about it, but speaking about it. Righteousness in this context often encompasses God's just actions, his upholding of what is right, and his covenant faithfulness.

"...and about your praise...": This signifies giving thanks, honor, and glory to God. It involves expressing gratitude for his goodness, acknowledging his power, and celebrating his greatness. This aspect of the verse emphasizes the positive affirmation and celebration of God's attributes.

"...all day long": This is a key element. It indicates a constant, ongoing, and unwavering devotion. It's not just a one-time expression or a fleeting moment of gratitude, but a habitual practice that permeates the psalmist's life. It implies that God's righteousness and praise are to be a central focus throughout the entire day, influencing their thoughts, words, and actions.

In summary, this verse is a pledge to make the praise of God a constant and vocal part of one's life. It shows a desire to be a living testament to God's righteousness and goodness, sharing that truth with others throughout the day. It highlights the importance of vocal worship and active declaration of faith.