Day unto day utters speech, And night unto night reveals knowledge.是什么意思？

Day unto day utters speech, And night unto night reveals knowledge.

这日到那日发出言语, 这夜到那夜传出知识.

day

n. 一天，白天，时期，节日；adj. 日间的，逐日的；adv. 每天，经常在白天地；

例句
Avant-garde music to this day has not found general public acceptance.
先锋音乐时至今日都没有得到大众的广泛认可。

unto

prep. 对，向，直到，在…旁边；

例句
Some of the landowners were a law unto themselves. There was nobody to check their excesses and they exploited the people.
某些土地所有者目无法纪。他们横行霸道，鱼肉乡民。

utters

v. 以口发出声音( utter的第三人称单数 )，说，讲；

例句
Whoever is partner with a thief hates his own soul; He hears the adjuration utters nothing.
与盗贼均分的,是恨恶自己的性命; 他听见叫人发誓作证的声音,却不言语.

speech

n. 演说，演讲，发言，说话，谈话，说话能力或方式，（乐器的）音，音色，方言，民族语言；

例句
The President declined to deliver the speech himself, on account of a sore throat...
总统因嗓子不适而婉拒了亲自讲话。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

night

n. 夜，晚上，（举行盛事的）夜晚；

例句
Video cameras with night vision can be activated by movement.
带夜视镜的摄像机一有动静就会启动。

reveals

v. 显示( reveal的第三人称单数 )，揭示，泄露，[神学]启示；

例句
A glance along his bookshelves reveals a bewildering array of interests...
看一眼他的书架就知道他兴趣繁杂。

knowledge

n. 了解，理解，知识（表示多方面的知识时有复数knowledges这一用法），学科，见闻；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。