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Matthew 5:16, like all Scripture which exhorts Christians to clarity and resolve, is part of the inward working of the Holy Spirit in sanctification, a life-long and progressive walk/stumble/learn/rise/walk some more.

But we are justified by the blood of Christ alone, according to God's will alone, ordained from before the foundation of the world for His glory alone. Rejoice, Kosta, that's the Good News which Christ came to proclaim.

"Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ:
According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will,
To the praise of the glory of his grace, wherein he hath made us accepted in the beloved.
In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace;
Wherein he hath abounded toward us in all wisdom and prudence;
Having made known unto us the mystery of his will, according to his good pleasure which he hath purposed in himself" -- Ephesians 1:3-9