Where can I find quotations from the Church Fathers on Mortal and Venial Sins?

[PioMagnus]

Hello,

Could you please give me some quotations from Church Fathers on Mortal and Venial sins? I was able to find the bible verses, but I have been unable to find any by the Fathers.

Thank you,

-pm

 

[Peggy_Frye]

Fathers on mortal and venial sin:

Mortal Sin

Confession