"There is no searching out of [Jehovah’s] understanding." ???

[Bible Speaks]

"There is no searching out of [Jehovah’s] understanding."— (Isa. 40:28)

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JEHOVAH is ‘the God who supplies comfort.’ One way that he comforts us is through the promises he has had recorded in his Word. (Romans 15:4, 5) 

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For example, when faced with the death of someone dear to you, what could be more comforting than the prospect of that loved one’s being resurrected in God’s new world? (John 5:28, 29) 

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And what about Jehovah’s promise that he will soon end wickedness and transform this earth into a paradise? Is it not comforting to have the prospect of surviving into that coming Paradise and never dying?—Psalm 37:9-11, 29; Revelation 21:3-5.

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Why can we trust the promises of God?

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Can we really trust the promises of God? Indeed, we can! The Maker of those promises is completely reliable. He has both the capability and the will to carry out his word. (Isaiah 55:10, 11) 

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This was powerfully can strengthen our faith in Jehovah, the Fulfiller of promises.

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At Isaiah 40:28, the expression “time indefinite” means “forever,” for Jehovah is “the King of eternity.”—1 Timothy 1:17.

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https://wol.jw.org/en/wol/d/r1/lp-e/1102000050?q=isa+40%3A28&p=par