“No-one is crushed by Fortune, unless they are first deceived by her…those who aren’t pompous in good times don’t have their bubbles burst with change. Against either circumstance, the stable person keeps their rational soul invincible, for it’s precisely in the good times they prove their strength against adversity.” Seneca, On Consolation to Helvia.
Good luck, bad luck, it’s all luck and not in your control. Don’t lose your head in either situation. Maintaining a calm and contained outlook is important, no matter what Lady Luck deals up for you. Smile, keep calm, and carry on.