Jiraiya hurriedly explained to Naruto why he had spoken that way just a moment before.
Jiraiya explained, "There are risks to learning Senjutsu on your own. Look at all these stone frogs around us—they aren't ordinary statues, but rather the remains of ninjas who failed their Senjutsu training and transformed into frogs. When practicing Senjutsu, you must precisely control the absorption of Natural Energy. The slightest misstep will throw off your balance and cause irreversible changes to your body. That is why Senjutsu must be practiced under the guidance and supervision of others. Now you know how reckless you were being just now!"
With a solemn and anxious tone, Jiraiya looked Naruto up and down to make sure he was unharmed. As it turned out, Jiraiya had been angry out of fear that Naruto would turn into a stone frog.
Chapter 165