妙法蓮華經玄贊 6.301

6.301

贊曰：此疾走也。自揣不能修行大行，速退大心規求作處，名疾走去。此時猶未住二乘中。

Commentary: This explains his running swiftly away. Estimating that he himself was unable to practice the great deeds, he quickly retreated from the great aspiration and sought a place to work; this is called 'running swiftly away.' At this time, he had not yet settled into the two vehicles.