The short answer
Yes, curses are real. To curse someone is a serious sin, equivalent to the evil of other sins like physical violence. As Christians, we are called to be a blessing to others. As Saint Paul says, "Bless those who persecute you; bless and do not curse" (Romans 12:14 NIV).
When people talk about “cursing” they usually mean “bad words” or “foul language,” but that understanding is a modern one. In the ancient world, a curse was a very specific thing, something you did to someone in the sense of “putting a curse on” someone else. But what is a curse? A curse literally means an “evil word.” The idea is that by using negative or ill-intentioned speech, you can actually cause things to happen to other people, or give them bad luck, or otherwise put negative energy in their lives that manifests in real, tangible ways. You might curse someone by saying, “May you never get married!” or “I hope you get fired from your job!” or “may you get hit by a car on your way home!” To put it into the modern language of “manifesting,” instead of manifesting something good in your own life, a curse is when you try to manifest something bad in someone else’s life.
What is a curse?
Words can have an effect on the physical world itself.
What does the Bible say about curses?
You might say that all of this sounds un-Christian, but the reality is that curses are frequently mentioned and discussed all throughout the text of scripture. Depending on the translation, the words “curse,” “cursed,” and “cursing” come up over 160 times in the Bible. Curses, being cursed, and putting curses on people appears in many different contexts, but there is one common denominator among all of them, which is an implicit understanding that speech has power to effect the physical world.

Hans Holbein the Younger - Samuel Cursing Saul - 1530
St. Paul warns the early church about engaging in this kind of practice. In his letter to the Romans he addresses this practice directly. He writes, “Bless those who persecute you; bless and do not curse them” (Rom 12:14). This is in the same spirit as Jesus’ admonitions to “love your enemies, do good to those who hate you” (Luke 6:27, see also Matt 5:43-48). In Christianity, the love of God is poured out onto everyone, so we who are trying to be like God need to pour out our love on everyone we meet, regardless of how they treat us.
Is cursing a sin?

In this illustration of John Milton's book Paradise Lost, Haughton & Lewis depict Sin pursued by Death.
To do evil to others, especially to wish evil on others and try to cause them harm, is therefore obviously sinful! And the sinfulness of cursing isn’t merely an old idea. A 20th century Christian monk named St. Paisios argued at length that curses are real and have real power. He wrote,
“A curse works when injustice is involved. If someone, for example, deceives a person who is suffering or does him harm and that person curses the wrongdoer, then not only the wrongdoer but even his kindred may be adversely affected. In other words, when I harm someone and that person curses me, the curse will be effective. God allows for this to happen in the same way that He allows, for example, for someone to kill a person.”
St. Paisios affirms that there is a real power to curses, but warns that to do so is equivalent to doing physical violence to a person. When asked by his interviewer about who suffers when a curse is pronounced, he replies:
“...The cursed person suffers in this life. The one who curses, however, will suffer not only in this life, but will also suffer in the next life because there God will treat him as a criminal unless he repents and confesses. All right; it may be that someone may have offended you. However, your cursing that person is equal to your taking a pistol and shooting him. Who gives you the right? No matter what the other person has done to you, you don’t have the right to kill him. Those who curse have malice—malevolence—in their hearts.”
This malevolence, the desire to hurt your fellow man, is obviously sinful. St. Paisios ultimately makes the same point as Jesus and St. Paul: we should not do harm to others. To do harm to others is to harm our own souls.
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