To be “cruel to be kind” is to cause someone pain for his or her own good. The phrase is used by Hamlet after he has berated his mother for her infidelity to the memory of her deceased husband

Hamlet

A tragedy by William Shakespeare. The king of Denmark has been murdered by his brother, Claudius, who then becomes king and marries the dead king’s widow. The ghost of the dead king visits his son, Prince Hamlet, and urges him to avenge the murder. In the course of the play, Hamlet, a scholar, slowly convinces himself that he must murder Claudius. The play ends with a duel between Hamlet and the courtier Laertes, and the death by poison of all the principal characters.

The character Hamlet has come to symbolize a person whose thoughtful nature is an obstacle to quick and decisive action.

Hamlet, Shakespeare’s longest play, contains several soliloquies—speeches in which Hamlet, alone, speaks his thoughts. Many lines from the play are very familiar, such as “Alas, poor Yorick!”; “Frailty, thy name is woman!”; Get thee to a nunnery

Though you say you’re my friend

I’m at my wits end

You say your love is bonafide

But that don’t coincide

With the things that you’re doing

When I ask you to be nice

You say you gotta be

Cruel to be kind, in the right measure

Cruel to be kind, it’s a very good sign

Cruel to be kind, means that I love you

Baby, you gotta be cruel to be kind

Well, I do my best to understand dear

But you still mystify, and I wanna know why

I pick myself up off the ground

And have you knock me back down

Again and again

And when I ask you to explain

You say you gotta be

Cruel to be kind, in the right measure

Cruel to be kind, it’s a very good sign

Cruel to be kind, means that I love you

Baby, you gotta be cruel to be kind

Well, I do my best to understand dear

But you still mystify, and I wanna know why

I pick myself up off the ground

And have you knock me back down

Again and again

And when I ask you to explain

You say you gotta be

Cruel to be kind, in the right measure

Cruel to be kind, it’s a very good sign

Cruel to be kind, means that I love you

Baby, you gotta be cruel to be kind

oh i forgot to give you an example

assume that your brother want to go out with his friends. but you have heard that one of his friends is devil and he want to make use of your brother to steal some shop. so what you are going to do . of course you don`t let him to go out. isn`t it so.