1 I Confess to you, holy brethren, I was afraid the cold would have made you cold in assembling yourselves together; but since you prove by this, your crowded assembly, that you are fervent in spirit, I doubt not that you have also prayed for me, that I may pay you what I owe. For I promised you in the name of Christ that, as the shortness of the time prevented us from expounding it before, I would today discuss why God was pleased to manifest the Holy Ghost in the form of a dove. That this may be explained, this day has dawned on us; and I perceive that from eagerness to hear, and pious devotion, you have come together in greater number than usual. May God, by our mouth, fulfill your expectation. For your coming together is of your love; but love of what? If of us, even that is well; for we desire to be loved by you, but not in ourselves. Because we love you in Christ, do you love us in Christ in return, and let our love mutually sigh towards God; for the note of the dove is a sighing or moaning.
Source: Tractates on the Gospel of John (New Advent)