Passage
The steadfast of mind You will keep in perfect peace Because he trusts in You.
Isaiah 26:3 (LSB)
Nearby Context
Isaiah 26:1 In that day this song will be sung in the land of Judah: “We have a strong city; He sets up walls and ramparts for salvation.
Isaiah 26:2 Open the gates, that the righteous nation may enter, The one that keeps faithfulness.
Isaiah 26:3 The steadfast of mind You will keep in perfect peace Because he trusts in You.
Isaiah 26:4 Trust in Yahweh forever, For in Yah—Yahweh Himself—we have an everlasting Rock.
Isaiah 26:5 For He has laid low those who settle on high, the exalted city; He brings it low, He brings it low to the ground, He casts it to the dust.
Study Lenses
The verse centers on "steadfast", "mind", "keep", "perfect", "peace", and "trusts". It is saying that the verse draws attention to "steadfast" and "mind", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 2's "Open the gates that the righteous nation..." into verse 4's "Trust in Yahweh forever For in Yah...", so "steadfast" and "mind" belong inside that flow. In Isaiah context, the local focus is the Holy One of Israel, judgment and restoration, the servant of the LORD, and Zion's hope.
A plain takeaway is to answer the verse's own emphasis on "steadfast" and "mind" with trust shaped by these words, not by a vague optimism outside the passage.