rāmera caritra saba - all the activities of Lord Rāmacandra; duḥkhera kāraṇa - causes of suffering; sva-tantra - although independent; līlāya - in the pastimes; duḥkha - unhappiness; sahena lakṣmaṇa - Lakṣmaṇa tolerates.

The activities of Lord Rāma were full of suffering, but Lakṣmaṇa, of His own accord, tolerated that suffering.