first published October 10, 2015
Parshat Noah, 6:15 S.V. "v'chafarta", R.S.R. Hirsch, New edition p. 182
The basic meaning of CPR is a protective or restrictive covering. In a sense, then, Copher means "Cover". Cappara is a covering.
V'al kol pesha-im techashe b'ahava...
In other words, to pray for Cappara is to pray that one's sins - or that the negative impact of these sins - will be covered up.
Teshuva is "returning to the state before sin". It is a retroactive process. Teshuva is the undoing of a sin.
Here is a mashal: A man gains weight and as a result his blood pressure rises.
A Cappara would be to take blood pressure medication. The man is shielded from the deleterious effects of his weight, even though he is still heavy.
Doing Teshuva would involve the man's dieting and exercising, losing the weight and reducing the hypertension. In other words, restoring his body back to the healthy way it was before the weight gain altered its body chemistry.
Of course, Teshuva is a more complete process. A thorough Teshuva might take years.
Yom Kippur is more of a quick fix. Perhaps it's necessary to take the palliative of Cappara before the cure of Teshuva is available.