注大乘入楞伽經 4.121

4.121

因上二障能障聖道，不證如來菩提涅槃二轉依果。凡學道者應修禪定，發生無漏妙慧，方能淨彼二障，故次說四種禪也。亦云六波羅蜜中，禪定一行最為神妙，能發起性上無漏智慧。萬行萬德，乃至神通光明，皆從定發。故三乘學人，欲求聖道，必須修禪，故通明四種禪也。

Because the above two obstructions can obstruct the noble path, preventing realization of the Tathāgata's two fruits of revolution of the basis—bodhi and nirvāṇa—ordinary practitioners of the path should cultivate dhyāna-concentration to give rise to uncontaminated, wondrous wisdom. Only then can they purify those two obstructions; hence, the four kinds of dhyāna are explained next. It is also said that among the six pāramitās, the single practice of dhyāna-concentration is the most wonderful and marvelous, able to produce uncontaminated wisdom within one's nature. Myriad practices and myriad virtues, up to spiritual powers and radiances, all arise from concentration. Therefore, students of the three vehicles seeking the noble path must cultivate dhyāna; hence the four kinds of dhyāna are explained throughout.