Albert Barnes Commentary Psalms 89:14

"Righteousness and justice are the foundation of thy throne: Lovingkindness and truth go before thy face." — Psalms 89:14 (ASV)

justice and judgment are the habitation of the throne - Margin, “establishment.” The Hebrew word - מכון mâkôn - properly means a place where one stands, and then a foundation or basis.

The idea here is that God's throne is founded on justice and right judgment; this is what supports it. His administration is maintained because it is right.

This foundation on justice supposes that right or justice exists in itself, or in the nature of things, independently of God's will. It further implies that the divine administration will conform to this inherent justice, and will be firm because it is thus conformed to it.

Even omnipotent power could not permanently maintain a throne founded on injustice and wrong. Such an administration would sooner or later make its own destruction sure.

Mercy, and truth shall go before thy face - This literally means to anticipate Your face; that is, Your goings.

Wherever You go, wherever You manifest Yourself, there will be mercy and faithfulness. Your march through the world will be attended with kindness and fidelity. So certain is this, that His coming will, as it were, be anticipated by truth and goodness.