Holy Matrimony is the first Sacrament that God created, when he created Adam and Eve. It is through the bond of husband and wife that man and woman can experience a sample of the intimacy that God invites us to have with Him, through Christ and his Church.
With regards to an unmarried and celibate priesthood, this, too, is completely biblical. Sacred Scripture, for example, says the following:
"I wish that all were as I myself am. But each has his own special gift from God, one of one kind and one of another" (1 Cor 7:7).
In the above quote, St. Paul is speaking about being unmarried. He wishes that "all" were like himself! His writings show us that those, like himself, who are called to celibacy, are able to commit themselves entirely to God and the service of others.
St. Paul continues...
"I want you to be free from anxieties. The unmarried man is anxious about the affairs of the Lord, how to please the Lord; but the married man is anxious about worldly affairs, how to please his wife, and his interests are divided. And the unmarried woman or virgin is anxious about the affairs of the Lord, how to be holy in body and spirit; but the married woman is anxious about worldly affairs, how to please her husband"(1 Cor 7:32-33).
"So that he who marries his betrothed does well; and he who refrains from marriage will do better"(v.38).
Therefore, the Roman Catholic discipline for an unmarried priesthood is not"unbiblical", nor is it for everybody. It is for individuals who wish to dedicate their lives solely to the work of Our Lord and the service of others.