One sometimes hears the impersonal saying, "Actions have consequences" -- an accurate but rather unenlightening observation. There also exists the old proverb, "Lie down with the dogs and you will rise with fleas".
To change the subject slightly, I'm with user76468 in deprecating the notion of karma as a sort of cosmic reward or punishment for past actions. To my mind, it's of a piece with that other vacuous trope of wishful thinking, "Everything happens for a reason".
In fact, there is in perpetual circulation on the internet a bunch of trite and irritating bromides that bespeak a slavish and idiotic mindset. Unfortunately, the emergence and evolution of the Web has rendered these excrescences of half-baked thinking immortal (or at least incapable of extinction), especially in the United States, where cultural backwardness and scientific and factual ignorance are widespread in the population (this site being one of the honourable exceptions).
Some of this contemptible claptrap takes the form of free-floating all-purpose fatalistic platitudes, while most of the rest is usually heard after someone dies, or following a greater or lesser misfortune of some other kind. For example:
"It must be Fate".
"It's {Destiny / Providence / the hand of the Almighty}".
"It {was / wasn't} meant to be".
"{We / you / they} {were / weren't} meant for each other".
"Ours is not to reason why".
"It's not for the likes of us to question the ways of the Almighty".
"It {was / must have been} God's will".
"God works in mysterious ways".
"It's (all) for the best".
"You'll be OK".
"Everything will be all right".
"It's the Universe telling us to [do X]".
"God doesn't give us more than we can handle".
"What will be, will be".
"No-one can know the mind of God".
"The ways of the Lord are mysterious indeed".
"It was bound to happen {someday / eventually}".
"It's all part of a greater plan".
"{He / she} {is at peace / is in a better place / is with God / has gone to live with the Lord}".
Presumably, those who accept this kind of delusional or self-deluding nonsense at face value are also those who are most likely to believe in astrology / tarot / fortune-telling / lucky numbers / crystal divination / supernatural deities / any of the other manifestations of superstitious belief or New Age mumbo-jumbo.