"Si quieres ser más fuerte, sé más fuerte."
— Jocko Willink
Simplified Meaning:
When someone tells you that becoming tougher is just about deciding to be tougher, it means that being strong comes from your mindset and choices. Imagine you're afraid of speaking in public. Every time you avoid it, it seems scarier. But if you decide to face your fear and talk in front of people a little bit each time, you start to become braver. It's the same with anything challenging in life; tough situations or people won’t always go away, but you can choose to handle them better each time. Refusing to let difficulties stop you, making small steps towards facing your challenges, and believing you can get through them makes you tougher over time. So, if you want to be strong and resilient, start acting as if you are, and eventually you will be.