Arthur E. Waite - The Pictorial Key to the Tarot :
Occult explanations attached to this card are meagre and mostly disconcerting. It is idle to indicate that it depicts min in all its aspects, because it bears this evidence on the surface. It is said further that it contains the first allusion to a material building, but I do not conceive that the Tower is more or less material than the pillars which we have met with in three previous cases.
I see nothing to warrant Papus in supposing that it is literally the fall of Adam, but there is more in favour of his alternative - that it signifies the materialization of the spiritual word. The bibliographer Christian imagines that it is the downfall of the mind, seeking to penetrate the mystery of God.
I agree rather with Grand Orient that it is the ruin of the House of We, when evil has prevailed therein, and above all that it is the rending of a House of Doctrine. I understand that the reference is, however, to a House of Falsehood. It illustrates also in the most comprehensive way the old truth that "except the Lord build the house, they labour in vain that build it."
There is a sense in which the catastrophe is a reflection from the previous card, but not on the side of the symbolism which I have tried to indicate therein. It is more correctly a question of analogy; one is concerned with the fall into the material and animal state, while the other signifies destruction on the intellectual side.
The Tower has been spoken of as the chastisement of pride and the intellect overwhelmed in the attempt to penetrate the Mystery of God; but in neither case do these explanations account for the two persons who are the living sufferers. The one is the literal word made void and the other its false interpretation.
In yet a deeper sense, it may signify also the end of a dispensation, but there is no possibility here for the consideration of this involved question.
P. D. Ouspensky – The Symbolism Of The Таrot :
I saw a lofty tower extending from earth to heaven; its golden crowned summit reached beyond the clouds. All round it black night reigned and thunder rumbled.
Suddenly the heavens opened, a thunder-clap shook the whole earth, and lightning struck the summit of the tower and felled the golden crown. A tongue of fire shot from heaven and the whole tower became filled with fire and smoke. Then I beheld the builders of the tower fall headlong to the ground.
And the voice said:
--"The building of the tower was begun by the disciples of the great Master in order to have a constant reminder of the Master's teaching that the true tower must be built in one's own soul, that in the tower built by hands there can be no mysteries, that no one can ascend to Heaven by treading stone steps.
"The tower should warn the people not to believe in it. It should serve as a reminder of the inner Temple and as a protection against the outer; it should be as a lighthouse, in a dangerous place where men have often been wrecked and where ships should not go.
"But by and by the disciples forgot the true covenant of the Master and what the tower symbolized, and began to believe in the tower of stone, they had built, and to teach others to so believe. They began to say that in this tower there is power, mystery and the spirit of the Master, that the tower itself is holy and that it is built for the coming Master according to His covenant and His will. And so they waited in the tower for the Master. Others did not believe this, or interpreted it differently. Then began disputes about the rights of the summit. Quarrels started, 'Our Master, your Master,' was said; 'our tower, your tower.' And the disciples ceased to understand each other. Their tongues had become confused.
"You understand the meaning here? They had begun to think that this is the tower of the Master, that He builds it through them, and that it must and, indeed, can be built right up to Heaven.
"And you see how Heaven responded?"