अपि चेदसि पापेभ्यः सर्वेभ्यः पापकृत्तमः। सर्वं ज्ञानप्लवेनैव वृजिनं सन्तरिष्यसि ॥

api ched asi pāpebhyaḥ sarvebhyaḥ pāpa-kṛit-tamaḥ sarvaṁ jñāna-plavenaiva vṛijinaṁ santariṣhyasi

Even if thou art the most sinful of all sinners, yet shalt thou cross over all sin by the raft of wisdom.

In plain words: Krishna says that even if Arjuna were the worst sinner of all, wisdom would carry him safely across all his sins, like a raft carries someone across a river.