śuni' prabhu hāsi' kahe suprasanna citta
'prakṛti darśana kaile ei prāyaścitta'
śuni'-hearing; prabhu—Śrī Caitanya Mahāprabhu; hāsi'-smiling; kahe—replied; su-prasanna citta—being in a happy mood; prakṛti darśana kaile—if someone sees women with a sensual propensity; ei prāyaścitta—this is the atonement.
When Śrī Caitanya Mahāprabhu heard these details, He smiled in a pleased mood and said, "If with sensual intentions one looks at women, this is the only process of atonement."
Link to this page: https://prabhupadabooks.com/cc/antya/2/165