Dalet means "door" and by extension gate or way. But a door or gateway to where? To an encounter of the divine presence in our lives. This requires the soul's attentive and humble disposition.
In regard to an arrogant person G-d says: "I and he cannot dwell together." The door to G-d's house allows for the humble of spirit to enter. The door itself, the dalet, is the property of humility and lowliness, as explained above. The dalet is also the initial letter of the word dirah, "dwelling place," as in the phrase "[G-d's] dwelling place below." Thus the full meaning of the dalet is the door through which the humble enter into the realization of G-d's dwelling place below. 37
This character also means number 4.This means the four realms of the universe in all its totality. According to Kabbalah, first there is Emanation involving the endless differentiation of divine energy. Second, Creation, or ideas without forms of structures. Third, Formation, containing patterns of physical reality. Action, actuality of matter.
We get a hint of these hidden dimensions of reality by observing the countless variations in designs found in Fractal Art. These are computer/mathematical generated designs based on nature's fundamental forms (e.g. cloud, tree, spiral, circle, etc.) which reveal the countless variations of basic patterns possible.
Christian Perspective
The door, portal and way into the inner sanctuary of God is in Jesus Christ who said, ""I am the way and the truth and the life." (Jn 14:6) The door is His humanity who reveals the Father's care concern of us. He is the truth, the Son of God, we must accept by faith in order to enter into God's presence. He is the life because through his Expiatory Sacrifice we enter into the life and love of the Triune God.
To accept Jesus Christ as our Savior requires humility. "Blessed are the poor in spirit for theirs is the kingdom of heaven." If God so humbled himself to take on the nature of man even to the death on a cross, should we not humble ourselves?
Hei literally means "take" which refers to the taking or giving of oneself.
As applied to God, Hei signifies divine revelation or creation and because the sound "Hei" is soft and requires little effort it symbolizes God's effortless breath in creating the cosmos. "By the LORD'S word the heavens were made; by the breath of his mouth all their host." (Ps 33:6) In the beginning "the earth was a formless wasteland, and darkness covered the abyss, while a mighty wind swept over the waters." And in Genesis 2:7 we read "the LORD God formed man out of the clay of the ground and blew into his nostrils the breath of life, and so man became a living being."
Christian Perspective
In retrospect, Christians have interpreted the "breath of God" in the Old Testament as the work of the Spirit of God in creation. The effortless way God deals with his creation is exemplified by the action of Christ.
One day on the Sea of Galilee, Jesus was asleep in the boat with his disciples when violent storm arose. They woke Jesus who rebuked the wind saying "Quiet! Be still!" The wind ceased and there was a great calm. The apostles began to wonder and to ask each other "Who then is this whom even the wind and sea obey." (Mk 5:35-41)
After his resurrection Jesus Appeared to his disciples, he breathed on them and said, "Received the Holy Spirit, whose sins you forgive, are forgiven them...."
Vav means "to join things together". It refers to physical wholeness and this existential unity has six dimensions above and below, right and left, front and back. Further, Vav means "and" and is a conjunction between words, sentences and concepts. This wholeness by extension refers to our relationship with God, the Earth and the people around us.
Zohar has observed that the six words of the Shema proclaim that all is united in the oneness of God.
Christian Perspective
The above being true, we must realize that God seeks unity of all people in his Plan of Salvation and again in God's Plan the living dynamics of the Triune God come into play.
Christ prayed, "that they all be one, as you, Father, are in me and I in you, that they all may be one in us...." And before returning to the Father, he told his disciple, "Go... and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, until the end of the age." (Mt.28:19-20)
Zayin, Chet, Tet