Acts 2:37-38

When the people heard this, they were conscience-smitten, and said to Peter and the rest of the Apostles: "Brothers, what can we do?"

2 Corinthians 7:10-11

For, when sorrow is in accordance with God's will, it results in a repentance leading to Salvation, and which will never be regretted. The sure result of the sorrow that the world knows is Death.

James 4:9

Grieve, mourn, and lament! Let your laughter be turned to mourning, and your happiness to gloom!

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