Theophylact of Bulgaria
He told them, "As the Bridegroom, I am present among them; therefore, they ought to rejoice and not mourn. He identifies Himself as 'the Bridegroom,' not merely because He has united pure souls to Himself, but also because this period of His initial advent is not characterized by sorrow and mourning for His followers. Rather, it is a time of consolation brought through baptism, independent of the works of the law. What labor is involved in receiving baptism? Yet, through this simple act, we attain salvation. The 'sons of the bridal chamber' refer to the apostles, as they have experienced the joy of the Lord and are beneficiaries of every heavenly gift and solace.
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Furthermore, one may recognize that anyone who embodies virtue is a 'son of the bridal chamber,' and as long as he remains in the presence of the Bridegroom, who is Christ, he does not engage in acts of repentance. After all, why should someone who has not stumbled repent? However, when the Bridegroom, who is Christ, is removed from him—meaning, when he succumbs to sin—then he begins to fast and repent to seek forgiveness for his transgressions.