not always. for most of the things (good or bad) logic explains it all for me. for instance, my academic success, being saved from a road accident, etc can all be explained by logic and i don't think i'm lucky for things like those. but i'll say that i'm lucky regarding my relationships, like having understanging parents, helpful siblings, few but great friends, and a loving girlfriend. saying that, my conclusion is yes, there's something called luck, but it really depends on you whether you are going to turn it into a good one or a bad one.