《明史·列传·卷一百四十三》
道周回答说： 以前还可以不说，到他们被选用后不说，往后就更加没有说的日子了。 
对曰： 先时犹可不言，至简用后不言，更无当言之日。 
Dao Zhou replied: "I could still not say it before, but after they were selected, I would have no chance to say it in the future."
<s>[INST] Kindly elucidate the central themes in this passage in English: 对曰： 先时犹可不言，至简用后不言，更无当言之日。  [/INST] Dao Zhou replied: "I could still not say it before, but after they were selected, I would have no chance to say it in the future."</s>
Kindly elucidate the central themes in this passage in English: 对曰： 先时犹可不言，至简用后不言，更无当言之日。
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Dao Zhou replied: "I could still not say it before, but after they were selected, I would have no chance to say it in the future."
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