The internality of the wisdom of Kabbalah is none other than the internality of the Bible, the Talmud, and the legends. The only difference between them is in their explanations. This is similar to a wisdom that has been translated into four languages. Naturally, the essence of the wisdom has not changed at all by the change of language. All we need to think of is which translation is the most convenient for conveying the wisdom to the student.
Baal HaSulam, “The Teaching of the Kabbalah and Its Essence”
The names, appellations, and Gematrias belong entirely to the wisdom of Kabbalah. The reason they are found in the other languages, too [Bible, laws, and legends], is that all the languages are included in the wisdom of Kabbalah. This is so because these are all particular cases that the other languages must be assisted with.
But one should not think that these four languages, which serve to explain the wisdom of Godly revelation, evolved one at a time, over time. The truth is that all four appeared before the sages simultaneously. In truth, each consists of all the others. The language of Kabbalah exists in the Bible, such as the standing on the Tzur (rock), the thirteen attributes of mercy in the Torah and in Micah, and, to an extent, it is sensed in each and every verse. There are also the chariots in Isaiah and Ezekiel, and atop them all The Song of Songs, all of which is purely the language of Kabbalah. It is similar in laws and in legends, and all the more so with the matter of the unerasable holy names, which bear the same meaning in all the languages.
Baal HaSulam, “The Teaching of the Kabbalah and Its Essence”