The Call to Holiness

From Isaiah 1:10-20 here:

Hear the word of the LORD, princes of Sodom! Listen to the instruction of our God, people of Gomorrah!
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7 What care I for the number of your sacrifices? says the LORD. I have had enough of whole-burnt rams and fat of fatlings; In the blood of calves, lambs and goats I find no pleasure.
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When you come in to visit me, who asks these things of you?
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8 Trample my courts no more! Bring no more worthless offerings; your incense is loathsome to me. New moon and sabbath, calling of assemblies, octaves with wickedness: these I cannot bear.
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Your new moons and festivals I detest; they weigh me down, I tire of the load.
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9 When you spread out your hands, I close my eyes to you; Though you pray the more, I will not listen. Your hands are full of blood!
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Wash yourselves clean! Put away your misdeeds from before my eyes; cease doing evil;
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learn to do good. Make justice your aim: redress the wronged, hear the orphan's plea, defend the widow.
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Come now, let us set things right, says the LORD: Though your sins be like scarlet, they may become white as snow; Though they be crimson red, they may become white as wool.
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If you are willing, and obey, you shall eat the good things of the land;
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But if you refuse and resist, the sword shall consume you: for the mouth of the LORD has spoken!