"Si sigues riéndote de la adversidad, el adversario eventualmente dejará de reír."

Simplified Meaning:

When you face tough situations with a positive attitude and keep smiling, any difficulties you encounter will lose their power over you. Imagine your problems as a bully trying to make you feel bad. If you don't show that you're upset and keep being cheerful, the bully will get bored and eventually leave you alone. Think of Thomas Edison, who failed many times before inventing the light bulb. Instead of getting upset, he saw each failure as a step closer to success, so he never let the setbacks weaken his spirit. If you adopt a similar attitude in your life, challenges won't seem so big, and you’ll become stronger. By staying positive, you show that no matter what happens, you won't be easily defeated. So, laugh in the face of your troubles, and soon, they won't seem as troubling.