Ecclesiastes 1:7 (ESV)
7 All streams run to the sea,
but the sea is not full;
to the place where the streams flow,
there they flow again.
Ecclesiastes 1:9 (ESV)
9 What has been is what will be,
and what has been done is what will be done,
and there is nothing new under the sun.
The Vanity of Wisdom
Ecclesiastes 1:15 (ESV)
15 What is crooked cannot be made straight,
and what is lacking cannot be counted.
Ecclesiastes 1:18 (ESV)
18 For in much wisdom is much vexation,
and he who increases knowledge increases sorrow.