When one has looked upon Jesus, though he be of little stature like Zacchaeus of old (cf. Lk. 19:3), and climb up on the top of the sycamore tree by mortifying his members which are upon the earth (cf. Col. 3:5), and having risen above the body of humiliation, then he shall receive the Word, and it shall be said to him, This day has salvation come to this house (cf. Lk. 19:9). Then let him lay hold on the salvation, and bring forth fruit more perfectly, scattering and pouring forth rightly that which as a publican he wrongly gathered.
Gregory of NazianzusMore Gregory of Nazianzus quotes
If anyone does not believe that Holy Mary is the Mother of God, he is severed from the Godhead. If anyone should assert that He passed through the Virgin as through a channel, and was not at once divinely and humanly formed in her (divinely, because without the intervention of a man; humanly, because in accordance with the laws of gestation), he is in like manner godless.
Gregory of Nazianzus