Where do books come from when they are used? What is the whole poem?

The full text is a time-consuming book. I hate it less, and nothing is difficult. I am afraid that there is a will.

This sentence comes from the diligent study of Warning. This is an exhortation couplet, not a poem.

This couplet means that when you need knowledge, you regret knowing only a little.

Book: knowledge. Arrival: Wait. Use: needed and useful. Time: time. Fang: Cai. Hate: regret, regret.