person A: I buy a lottery ticket every day but for some reason I have not won more than $10. My luck will soon change!
person B: Well You can be hopeful. But i think you should  stop gambling
person A: No_comma_ I am pretty sure I will be one of the lucky ones who hits the jackpot. It's not gambling if it is a sure thing!
person B: If it is sure then you do not need luck