金光明最勝王經疏 2.107

2.107

贊曰：無是救護，故起愛求。此即敬佛難逢喻。言然彼貧人者，喻異生外道，其心下劣、善根薄少。或詣王家者，喻其覺悟，方於世尊起難逢見想，故如國王。或大臣者，如大菩薩。壽命亦長，為生現促，因亦覺悟。

The commentary says: Having no such salvation, they therefore give rise to love and seeking. This is the simile of revering the Buddha as rare to encounter. The words “Yet that poor person” are a simile for ordinary beings and non-Buddhists whose minds are inferior and whose roots of goodness are meager and few. “Goes either to a king’s household” is a simile for their awakening, only then giving rise to the thought of the World-Honoured One being rare to meet and see; hence he is like a king. “Or a chief minister’s” is like a great bodhisattva. Their lifespans are also long, but for the sake of sentient beings they manifest them as brief, through which [sentient beings] are also awakened.