St. Basil the Great, Moralia I,1
Matthew 4, 17:
17From that time Jesus began to preach, and to say, Repent: for the kingdom of heaven is at hand.
Matthew 11, 19-22:
19The Son of man came eating and drinking, and they say, Behold a man gluttonous, and a winebibber, a friend of publicans and sinners. But wisdom is justified of her children.
20Then began he to upbraid the cities wherein most of his mighty works were done, because they repented not:
21Woe unto thee, Chorazin! woe unto thee, Bethsaida! for if the mighty works, which were done in you, had been done in Tyre and Sidon, they would have repented long ago in sackcloth and ashes.
22But I say unto you, It shall be more tolerable for Tyre and Sidon at the day of judgment, than for you.
That those who believe in the Lord must first repent, according to the preaching of John and our Lord Jesus Christ Himself; for those who do not repent now are condemned with more severity than those who were condemned before the Gospel.
Translation: W.K.L. Clarke (The Ascetical Works of Saint Basil)
That they who believe in the Lord must first do penance according to the preaching of Jon and of our Lord Jesus Christ Himself; for they who do not penance now will receive a harsher sentence that those who were condemned before the time of the Gospel.
Translation: Sister M Monica Wagner C.S.C. (Saint Basil Ascetical Works)