Isaiah 55:9

For as the heavens are higher - I am persuaded that כ caph, the particle of comparison, is lost in this place, from the likeness of the particle כי ki, immediately preceding it. So Houbigant and Secker. And their remark is confirmed by all the ancient Versions, which express it; and by the following passage of Psalm 103:11, which is almost the same: -

הארץ על שמים כגבה כי haarets al shamayim chigboah ki יראיו על חסדו גבר yereaiv al chasdo gabar

"For as the heavens are high above the earth,

So high is his goodness over them that fear him."

Where, by the nature of the sentence, the verb in the second line ought to be the same with that in the first; גבה gabah, not גבר gabar: so Archbishop Secker conjectured; referring however to Psalm 117:2.

For as the heavens ... - This verse is designed merely to illustrate the idea in the former. There is as great a difference between the plans of God and those of people, as between the heavens and the earth. A similar comparison occurs in Psalm 103:11 -

For as the heaven is high alcove the earth,

So great is his mercy toward them that fear him.

Compare Psalm 57:10 -

For thy mercy is great unto the heavens,

And thy truth unto the clouds.

Also Psalm 89:2 -

Mercy shall be built up forever,

Thy faithfulness shalt thou establish in the very heavens.

The idea in all these passages is substantially the same - that the mercy and compassion of God are illimitable.