【数往知来】〖sh wng zh lái〗[In retracing the past, the future can be known; count the past and know the future; From the knowledge of the past one is able to infer what will come]

数行一目阅书博，

往复循环识积多。

知古察今测演变，

来龙去脉探推悉。

明了过去，可以推知未来。Know past clear, can infer future.