a decree is…

A decree is in effect or in motion; operative the moment it is read or spoken.

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A decree is a command or order; charge; demand; direction; instruction from a King.

A decree is promised or guaranteed; sworn; vowed on an oath or covenant by a King.

A decree is an expressed will or intention; desire; dictate; aim; determination of a King.​

A decree is everlasting or eternal; imperishable; undying; indestructible; incorruptible; abiding.

decree and kings...

The decree of a King is never issued without the power to enforce it or the ability to execute it.

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Whatever the King decrees, He already possesses the ability or He is the ability to bring it to pass.

decrees and God...

When God decrees, the whole creation obeys or submit; yield; give in; surrenders.

What God decrees comes to pass or He will have to resign or abdicate; quit; vacate; stand down from being God.