楞伽阿跋多羅寶經註解 1.626

1.626

三乘者，聲聞、緣覺、不定三種性也。一乘，如來種性也。非乘，各別種性也。如來之意但說一乘，為機器不齊故，說三乘非乘，引權歸實。諸聖遠離寂，即樂入寂滅，四果聖人也。

"The three vehicles" refers to the three lineages of Śrāvakas, Pratyekabuddhas, and the indeterminate. "The one vehicle" is the Tathāgata-gotra. "The non-vehicle" is the discrete lineage. The Tathāgata's intent was only to teach the one vehicle, but because capacities are not uniform, he taught the three vehicles and the non-vehicle, guiding the provisional back to the real. "The noble ones aloof in quietude" refers to the noble ones of the four fruits who delight in entering into extinction and quietude.