Suppose two people are walking together and see a chicken and a duck.
One of them says, ‘Why isn’t that chicken like the duck, why isn’t the duck like the chicken?’ He wants the chicken to be a duck and the duck to be a chicken.
If it’s impossible, then even if that person were to wish for the duck to be a chicken and the chicken to be a duck for the rest of his life it would not come to pass, because the chicken is a chicken and the duck is a duck.
As long as that person thought like that he would suffer.
The other person might see that the chicken is a chicken and the duck is a duck, and that’s all there is to it. There is no problem. He sees rightly. If you want the duck to be a chicken and the chicken to be a duck, you are really going to suffer.
~ Ajahn Chah.