The righteous have wisdom (Ps 37:30-37:31)

Phe     

“The mouths of the righteous utter wisdom.

Their tongues speak justice.

The law of their God is in their hearts.

Their steps do not slip.”

The righteous ones utter wise statements since they are wise. They speak justice with their tongues because the law of God is in their hearts. Thus their steps never slip or fail.