Caitanya-caritāmṛta 22.127
sarvathā śaraṇāpatti, kārtikādi-vrata ‘catuḥ-ṣaṣṭi aṅga’ ei parama-mahattva
[sarvathaa sharanaapatti, kaartikaadi-vrata ‘chatuh-shashti anga’ ei parama-mahattva]
Blended reading (Sanskrit + English inline)
sarvathā śaraṇāpatti, kārtikādi-vrata ‘catuḥ-ṣaṣṭi aṅga’ ei parama-mahattva
“(34) One should surrender to Kṛṣṇa in all respects. (35) One should observe particular vows like kārttika-vrata. These are some of the sixty-four important items of devotional service.
My note
Source: vedabase.io