Ecclesiastes 1:7

Overview - Ecclesiastes 1
The preacher shews that all human courses are vain;
because the creatures are restless in their courses,
they bring forth nothing new, and all old things are forgotten;
12 and because he has found it so in the studies of wisdom.
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Ecclesiastes 1:7  (King James Version)
All the rivers run into the sea; yet the sea is not full; unto the place from whence the rivers come, thither they return again.

the rivers run
Job 38:10 Job 38:11 ; Psalms 104:6-9

return again
Hebrew return to go.