增壹阿含經 50.8.p23

50.8.p23

“It’s like someone who leaves the village looking for a dangerous snake. After seeing the snake, they use a metal fork to first pin its head. After that, they grasp its neck to prevent it from moving. If that dangerous snake were to twist around wanting to hurt the person, it’ll never reach him. That’s the reason, monks, that they grasp it by its neck. This good son is likewise. Reciting and studying the teachings, there’s none that he doesn’t penetrate. He examines their meaning and follows their principles without any shortcomings. Because of these causes and conditions, he gradually arrives at Nirvāṇa. That’s the reason he grasps the correct teaching.