Jesus said at different occasions things like, "You must become as a little child to enter the Kingdom," or "Seek to enter by the narrow gate," and yet again, "It is easier for a camel to pass through the eye of a needle than for a rich man to enter into the Kingdom of Heaven." He is speaking about humility: the ability to become small.
This type of smallness is ironically something which we "shrink from" and find difficult. The smallness required is a humility that can receive a Love so great as the Eternal Father's love for the Son. In eternity the Son is so humble in receiving everything the Father bestows upon him that he seeks to grasp at none of it but rather "he empties Himself taking the form of a slave" although He is every bit the Heir, the Eternally Begotten Son. The Son completely, continuously, and dynamically empties Himself back to the Father. He reciprocates all Love to the Father through the Person of the Holy Spirit who is the Love so strong between the Father and the Son as to be another Person of the Trinity.
The Holy Spirit descended upon a young Woman who was very small and humble of heart.
The Eternal Word took on flesh in her by "emptying Himself and taking the form of a slave" in her womb becoming "like us in every way except sin". He became a tiny conceived human being that he might be born among us and save us from our sins.
We too must become small that we can receive so great a Truth as the Father wants to bestow upon us by the power of the Holy Spirit. The Word of God must be conceived in us and be born of us that we might be conceived in Eternal Beggetting of Son by the Divine Father and be born into Eternal life.
May God's Holy Spirit help us to be small and humble to receive so great a Mystery. Amen.