Christians believe "you reap what you sow" which is basically a definition of karma in today's world.
The Golden Rule - "Do unto others as you would have them do unto you" is another example of how Christians believe in a specific law of the universe that repays your actions right back atcha in a similar fashion.
Definitions change over time, so the original meaning which was related to reincarnation has been transformed into a measure of a life, a moral compass.
"What goes around comes around" is also a popular belief that parallels karma.
These are laws of the universe and the same thread runs through most of our dominant religions and belief systems.
Taken from an article at Tickle...
In Hinduism, karma is focused on the individual, who is encouraged to offer their actions to God. Hindus believe that the soul is reincarnated, with each soul engaging in a continual process of birth-death-rebirth over many lifetimes. In each life, the soul's karma dictates the kind of life that person will have. If you've accumulated enough good karma, you'll be reborn into a more comfortable life that includes the opportunity to share the knowledge you have gained through behaving the right way in past lives. After living many lives of continued good karma, you reach a state of Nirvana, free from the cycle of birth-death-rebirth.
Buddhist beliefs about karma have a good amount in common with Hinduism. This is because both religions are informed by the sacred texts known as the Vedas. Thus, these religions are called the Vedic Faiths. Hindu and Buddhism both believe in reincarnation and karma. However, in Buddhism, instead of offering your actions to God, individuals are encouraged to follow the eight-fold path, which is a course of ideal action that leads to enlightenment. Buddhists also reject the notion of a social hierarchy and with it, the idea that good karma will allow your soul to be reborn into a higher social position.
Regardless of your spiritual faith, the concept of karma is a useful one in determining how to lead a good life. By monitoring your intended thoughts, words, and actions, you can see for yourself how much good you're putting out into the world, and thus how much you can expect to receive in return.
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