Seeing the bow the two princes gasped in appreciation. Rāma bowed down in respect and then walked slowly around it. He looked towards Viśvāmitra who nodded slightly. Understanding Viśvāmitra’s indication, Rāma stood with joined palms at the bow’s center. He turned to Janaka. “I wish to attempt your test. I shall now try to lift this heavenly bow to gauge its weight and strength.”
While being extolled by Viśvāmitra and other sages, who uttered “Victory! Victory!” Rāma placed his hand upon the bow. There was complete silence in the hall. Janaka held his breath as Rāma stood motionless. Viśvāmitra, knowing the extent of Rāma’s power, smiled slightly
In the balcony of the hall stood Sītā. She looked at Rāma, feeling a natural attraction for the prince. Until then She had never been interested in any of Her suitors, although the most powerful kings from all around the world had come there. To the gentle Sītā they were all arrogant and overly proud of themselves. Sītā was deeply religious. All Her life She had prayed that Viṣṇu might become Her husband. As She watched Rāma approach the bow She felt Her love for the Lord being awakened. Was this Viṣṇu himself? Becoming absorbed in Her loving sentiment, Sītā felt anxiety. Would Rāma string the bow and become Her husband? She held the matrimonial garland with trembling hands.
Janaka was amazed. He turned to Viśvāmitra. “I have now witnessed Rāma’s strength. His achievement is incredible. Having secured Rāma as Her husband, Sītā will bring undying fame to my family.”
Reference: Ramayana – Krishna Dharma Das