Isaiah 26:3-5

New International Version - UK

³ You will keep in perfect peace
    those whose minds are steadfast,
    because they trust in you.
⁴ Trust in the Lord for ever,
    for the Lord, the Lord himself, is the Rock eternal.
⁵ He humbles those who dwell on high,
    he lays the lofty city low;
he levels it to the ground
    and casts it down to the dust.