This is probably a little lame since it's so well known... but I really like the phrase Carpe Diem ("seize the day" if you don't know)... it's something everyone can try to do
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"In matters of grave importance, style, not sincerity, is the vital thing"
beau monde (boh' mond') [Fr.]: high society. “Such elegant decor would impress even the beau monde.”
bon vivant (bon vee-vahnt') [Fr.]: a person who lives luxuriously and enjoys good food and drink. “It's true he's quite the bon vivant, but when he gets down to business he conducts himself like a Spartan.”
glasnost (glaz'nohst) [Rus.]: open and frank discussion: initiated by Mikhail Gorbachev in 1985 in the Soviet Union. “Once the old chairman retired, the spirit of glasnost pervaded the department.”
sans souci (sahn soo-see') [Fr.]: carefree. “After serveral glasses of champagne, their mood turned distinctly sans souci.”
Weltschmerz (velt'shmerts) [Ger.]: sorrow over the evils of the world. “His poetry expressed a certain Weltschmerz, or world-weariness.”