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When feeling down, or when seeking happiness through external means try to think,

"Since the beginning of my life I have sought for the source of happiness outside my own mind, and I have not been able to stay happy. I know that to be happy I must try to understand my own mind long before that of others."

Then make the solid determination that you will be happy despite whatever conditions you encounter as this is the only way anyone can achieve a permanently, and independently happy mind.