Passage
The law of his God is in his heart. None of his steps shall slide.
The law of his God is in his heart. None of his steps shall slide.
Psalms 37:29 The righteous shall inherit the land, and live in it forever.
Psalms 37:30 The mouth of the righteous talks of wisdom. His tongue speaks justice.
Psalms 37:31 The law of his God is in his heart. None of his steps shall slide.
Psalms 37:32 The wicked watches the righteous, and seeks to kill him.
Psalms 37:33 Yahweh will not leave him in his hand, nor condemn him when he is judged.
The verse centers on "heart", "none", "steps", "shall", and "slide". It is saying that the verse draws attention to "heart" and "none", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 30's "The mouth of the righteous talks of..." into verse 32's "The wicked watches the righteous and seeks...", so "heart" and "none" belong inside that flow. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "heart" and "none" with trust shaped by these words, not by a vague optimism outside the passage.