This proverb highlights the duality between the appearance of calm and the ability to take action. At first glance, one might think the frog is inert and docile, but as soon as it moves, it unleashes its full energy like a young man full of vitality. It teaches us not to judge someone solely by their appearance, as everyone has hidden strength that can manifest in unexpected ways. An equivalent in English would be “Don’t judge a book by its cover”.