君子养心莫善于诚,致诚则无他事矣。
出自先秦《荀子·不苟》。君子加强道德修养没有比“诚”更重要的,达到了“诚”的要求也就到了修身养性的最高境界了。
Another thing I think should be avoided is extremely intense ideology because it cabbages up one's mind...when you're young it's easy to drift into royalties and when you announce that you're a loyal member...and you're gradually ruining your mind.
Life is like a roller coaster, live it, be happy, enjoy life.