"没有单一的痛苦。如果我能够应对一种痛苦，我就能够应对所有的痛苦。"

Simplified Meaning:

This saying means that all types of pain or difficulties in life are connected. If you learn how to deal with one hard situation, you can use that same strength and skill to handle other tough times. Imagine you are learning to ride a bicycle. At first, it’s very hard, and you might fall and get hurt. But once you figure out how to balance and pedal, you can ride any bicycle, no matter where you are. In life, when you go through a difficult experience, like losing a job, you discover how strong and resourceful you can be. This experience makes you more resilient, so if you face another problem, like a breakup, you already know you have the strength to get through it. Knowing you can survive and adapt makes you confident about facing future challenges. So, when life gets tough, remember the strength you found to handle past problems and use it to deal with new ones.