131:1 Lord, my heart is not haughty, nor mine eyes lofty: neither do I exercise myself in great matters, or in things too high for me.
131:2 Surely I have behaved and quieted myself, as a child that is weaned of his mother: my soul is even as a weaned child.
131:3 Let Israel hope in the LORD from henceforth and for ever.
The verse centers on "lord", "heart", "haughty", "mine", "eyes", "lofty", "neither", and "exercise". It is saying that the verse draws attention to "lord" and "heart", so its meaning should be read from those terms before moving to application.
The local KJV text gives this verse as the immediate unit, so "lord" and "heart" carries the first interpretive weight. 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 "lord" and "heart" with trust shaped by these words, not by a vague optimism outside the passage.