Bhagavad Gita 4.36
Even if you are the greatest of sinners, you will cross over all sin by the ferryboat of wisdom.
अपि चेदसि पापेभ्यः सर्वेभ्यः पापकृत्तमः।
सर्वं ज्ञानप्लवेनैव वृजिनं सन्तरिष्यसि॥api cedasi pāpebhyaḥ sarvebhyaḥ pāpakṛttamaḥ|
sarvaṃ jñānaplavenaiva vṛjinaṃ santariṣyasi||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).