Passage
Their sound hath gone forth into all the earth: and their words unto the ends of the world.
Their sound hath gone forth into all the earth: and their words unto the ends of the world.
Psalms 18:3 Day to day uttereth speech, and night to night sheweth knowledge.
Psalms 18:4 There are no speeches nor languages, where their voices are not heard.
Psalms 18:5 Their sound hath gone forth into all the earth: and their words unto the ends of the world.
Psalms 18:6 He hath set his tabernacle in the sun: and he as a bridegroom coming out of his bridechamber, Hath rejoiced as a giant to run the way:
Psalms 18:7 His going out is from the end of heaven, And his circuit even to the end thereof: and there is no one that can hide himself from his heat.
The verse centers on "world", "sound", "hath", "gone", "forth", "earth", "words", and "ends". It is saying that the verse draws attention to "world" and "sound", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 4's "There are no speeches nor languages where..." into verse 6's "He hath set his tabernacle in the...", so "world" and "sound" 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 "world" and "sound" with trust shaped by these words, not by a vague optimism outside the passage.