CC Ādi 5.150

rāmera caritra saba, — duḥkhera kāraṇa
svatantra līlāya duḥkha sahena lakṣmaṇa
Word for word: 
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.
Translation: 
The activities of Lord Rāma were full of suffering, but Lakṣmaṇa, of His own accord, tolerated that suffering.