It is acknowledged in Scripture that it rains on the just and on the unjust. Matthew 5:45 Sunrise comes on the horizon every 24 hours, whether you are a believer or an unbeliever. I believe that it is the interplay of darkness that makes light so vivid. It is the pelting of the storms that makes the clear day so welcome. King David, in the Bible, knew the battlefield well. In the Psalm 120 he pours out his heart to God in song. He speaks of growing tired of the tents of war. He grows weary and wishes for peace. He attempts to make a peace treaty, but his enemy rejects his offer and demands war.
War Between the Houses of David and Saul by Gustav Doré
-Helkathhazzurim (Field of Daggers) 2 Samuel 2:8-17
In my distress I cried unto the LORD, and he heard me.
Deliver my soul, O LORD, from lying lips, and from a deceitful tongue.
What shall be given unto you? or what shall be done unto you, you false tongue?
Sharp arrows of the mighty, with coals of juniper.
Woe is me, that I sojourn in Meshech, that I dwell in the tents of Kedar!
My soul has long dwelt with him that hates peace.
I am for peace: but when I speak, they are for war.
David reminds himself that no matter how the evil speaks against him, and no matter how far they attempt to hide from God in their evil ways, the sharp arrows of the Almighty will pursue them and fill them with the terrors of the Lord. Job 6:4 Burning coals of juniper do not flame or crackle, but have an excessive heat, and they are long-burning (some say year round) even when they seem to be gone out. The false tongue will have a place in the lake that burns eternally. Revelation 22:15
This is why it is said that vengeance belongs to God. Romans 12:19 Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, says the Lord. We don't have to worry when an enemy does us a bad turn. Justice belongs to God and He makes all just. We just have to leave it in His hands like David sang.