The Church received from the apostles the tradition of giving baptism even to infants. The apostles, to whom were committed the secrets of the divine sacraments, knew there are in everyone innate strains of [original] sin, which must be washed away through water and the Spirit
OrigenThis also is a part of the teaching of the Church, that there are certain angels of God, and certain good influences, which are His servants in accomplishing the salvation of men.
OrigenWe must believe what is good and true about the prophets, that they were sages, that they did understand what proceeded from their mouths, and that they bore prudence on their lips.
OrigenEvery soul... comes into the world strengthened by the victories or weakened by the defeats of its' previous life. Its' place in this world as a vessel appointed to honor or dishonor, is determined by its' previous merits or demerits. Its' work in this world determines its' place in the world which is to follow this.
OrigenEvery soul that is born into flesh is soiled by the filth of wickedness and sin. . . . In the Church, baptism is given for the remission of sins, and, according to the usage of the Church, baptism is given even to infants. If there were nothing in infants which required the remission of sins and nothing in them pertinent to forgiveness, the grace of baptism would seem superfluous
Origen