It is incomprehensible to the sophisticated adult, yet it is immediately apparent to the child. His second advent we know to be the Second Coming - His return in judgment is to complete His unfinished business. His advent tells us that life is not aimless, purposeless, without a terminus, a meaning, or a direction. It is to Him that we tend because He first tended to us. The reason why we were born, the reason why we live our lives here on earth, and the reason why we die is because He first came to us, brought us to life, and seeks to have us love Him.
Love is that way.
Love is so good that it simply cannot keep everything unto Itself. It MUST be shared. Hence, He comes to us that we might come to Him. The third advent is God's daily coming to us. He surrounds us, whispers to us, touches us, calls us, and reaches out to us every day we live here in this life.