Perfect / Proven / Shield

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He is the Rock, His work is perfect;
for all His ways are justice, a God
of truth and without injustice;
Righteous and upright is He.
Deuteronomy 32:4

Every word of God is pure; He is a shield 
to those who put their trust in Him.
Proverbs 30:5

And do not be conformed to this world, but
be transformed by the renewing of your mind,
that you may prove what is that good and
acceptable and perfect will of God.
Romans 12:2