Passage
Behold, he that keepeth Israel Will neither slumber nor sleep.
Behold, he that keepeth Israel Will neither slumber nor sleep.
Psalms 121:2 My help [cometh] from Jehovah, Who made heaven and earth.
Psalms 121:3 He will not suffer thy foot to be moved: He that keepeth thee will not slumber.
Psalms 121:4 Behold, he that keepeth Israel Will neither slumber nor sleep.
Psalms 121:5 Jehovah is thy keeper: Jehovah is thy shade upon thy right hand.
Psalms 121:6 The sun shall not smite thee by day, Nor the moon by night.
The verse centers on "behold", "keepeth", "israel", "neither", "slumber", and "sleep". It is saying that the verse draws attention to "behold" and "keepeth", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 3's "He will not suffer thy foot to..." into verse 5's "Jehovah is thy keeper Jehovah is thy...", so "behold" and "keepeth" 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 "behold" and "keepeth" with trust shaped by these words, not by a vague optimism outside the passage.