佛祖統紀 3.133

3.133

祕密立體。籤釋玄文云。身口意密。隨何四門無礙。又籤云。以祕密不出此七。逸堂以三密四門為當體體。真中二理為所依體。石坡以七教為所用體。雖皆有憑。要必以七教為義足。

The establishment of the essence of the Secret [Teaching]: The Qian, commenting on the Xuan text, says: 'The mysteries of body, speech, and mind are unimpeded according to any of the four gates.' Furthermore, the Qian says: 'Because the secret does not go beyond these seven.' Yitang took the three mysteries and four gates as the intrinsic essence, and the two principles of truth and the middle as the underlying essence. Shipao took the seven teachings as the functional essence. Although each has textual basis, it must necessarily take the seven teachings as fulfilling the doctrinal meaning.