Why is it good to show repentance also in your outward appearance?
Joel 1:13 (ESV)
13Put on sackcloth and lament, O priests; wail, O ministers of the altar. Go in, pass the night in sackcloth, O ministers of my God! Because grain offering and drink offering are withheld from the house of your God.
By outward demonstration of your sorrow, you strengthen the inward sorrow that is at issue: the sorrow in your heart.
13 Put on sackcloth and lament, O priests; wail, O ministers of the altar. Go in, pass the night in sackcloth, O ministers of my God! Because grain offering and drink offering are withheld from the house of your God.