If you will go to the temple and remember that the teaching is symbolic, you will never go in the proper spirit without coming away with your vision extended, feeling a little more exalted, with your knowledge increased as to things that are spiritual. The teaching plan is superb. It is inspired. The Lord Himself, the Master Teacher, taught His disciples constantly in parables—a verbal way to represent symbolically things that might otherwise be difficult to understand.

Boyd K. Packer

https://www.lds.org/ensign/2010/10/the-holy-temple?lang=eng

In a symbolic way, the teachings and rituals of the temple take us on an upward journey toward eternal life, ending with a symbolic entrance into the presence of God. The characters depicted, the physical setting, the clothing worn, the signs given, and all the events covered in the temple are symbolic. When they are understood, they will help each person recognize truth and grow spiritually.

http://www.lds.org/manual/endowed-from-on-high-temple-preparation-seminar-teachers-manual/lesson-5-learning-from-the-lord-through-symbols?lang=eng

Discussing the Endowment:

"Bro[ther] Joseph [Smith] turned to me [Brigham Young] and said: “Brother Brigham this is not arranged right, but we have done the best we could under the circumstances in which we are placed, and I wish you to take this mat[t]er in hand and organize and systematize all these ceremonies with the signs, tokens, penalties and key words.” I did so and each time I got something more; so that when we went through the Temple at Nauvoo, I understood and knew how to place them there. We had our ceremonies pretty correct."

http://www.dialoguejournal.com/wp-content/uploads/sbi/articles/Dialogue_V20N04_35.pdf