Verse 4

अयं हि परदुष्पारो घोरः संसारसागरः ।विना युक्तिप्रयत्नाभ्यामस्माद्राम न तीर्यते

In plain words

This ocean of saṃsāra is indeed terrible, exceedingly hard to cross; without yukti and effort together, Rāma, it is not crossed.