What is the reason why priests can't get married?

The reason why Catholic priests can't get married is that Catholicism believes that it is not the essential requirement of clergy to stipulate that priests can't get married, but only a supplementary condition, because priests are specially selected and summoned by God to undertake the clergy, so as to continue Jesus' sacred cause and great mission of saving the world and saving mankind.

Christianity believes that this provision is anti-human and also to show a complete break with Catholicism. So it is stipulated that priests can get married.