Carol Zaleski discusses the necessity of of having a sound doctrine of angels:
The venture of believing in angels is worth making, even at the risk of confounding the details. We have to rely, as Gregory puts it, on authoritative hearsay—on the Bible and its interpreters, on the Church and her traditions. But one thing is clear: Angels are so inextricably wound about the great mysteries of creation, revelation, and redemption recorded in Scripture that they cannot be pruned back without endangering the main body of Christian faith and practice. The same biblical witness on whose authority Christ is received into the hearts of believers claims with no less authority that angels are real, that there is a host of intelligences who stand in the presence of God, who are bearers of divine revelation, who guide the nations, who fight alongside armies—along with angels who, if their will has been twisted, pervert all these functions, distorting every divine message and poisoning every just cause. Where belief in angels is neglected or suppressed, self-help spiritualism rushes in to fill the gap; where the cult of angels is exaggerated or made an end in itself, all manner of nonsense is unleashed.