Is there any thing whereof it may be said, See, this is new? it hath been already of old time, which was before us.(Ecclesiastes 1:10)

There is no remembrance of former things; neither shall there be any remembrance of things that are to come with those that shall come after.(Ecclesiastes 1:11)

I the Preacher was king over Israel in Jerusalem.(Ecclesiastes 1:12)

And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this sore travail hath God given to the sons of man to be exercised therewith.

I have seen all the works that are done under the sun; and, behold, all is vanity and vexation of spirit.(Ecclesiastes 1:14)

That which is crooked cannot be made straight: and that which is wanting cannot be numbered.(Ecclesiastes 1:15)

I communed with mine own heart, saying, Lo, I am come to great estate, and have gotten more wisdom than all they that have been before me in Jerusalem: yea, my heart had great experience of wisdom and knowledge.(Ecclesiastes 1:16)

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Ecclesiastes 1:13 - Cross Reference

For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity. (Ecclesiastes 2:23)

So that thou incline thine ear unto wisdom, and apply thine heart to understanding; (Proverbs 2:2)

And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit. (Ecclesiastes 1:17)

In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return. (Genesis 3:19)

The works of the LORD are great, sought out of all them that have pleasure therein. (Psalm 111:2)

Through desire a man, having separated himself, seeketh and intermeddleth with all wisdom. (Proverbs 18:1)

Meditate upon these things; give thyself wholly to them; that thy profiting may appear to all. (1 Timothy 4:15)

And further, by these, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh. (Ecclesiastes 12:12)

Wisdom is the principal thing; therefore get wisdom: and with all thy getting get understanding. (Proverbs 4:7)

Again, I considered all travail, and every right work, that for this a man is envied of his neighbour. This is also vanity and vexation of spirit. (Ecclesiastes 4:4)

My son, give me thine heart, and let thine eyes observe my ways. (Proverbs 23:26)

The heart of the prudent getteth knowledge; and the ear of the wise seeketh knowledge. (Proverbs 18:15)

For God giveth to a man that is good in his sight wisdom, and knowledge, and joy: but to the sinner he giveth travail, to gather and to heap up, that he may give to him that is good before God. This also is vanity and vexation of spirit. (Ecclesiastes 2:26)

All this have I seen, and applied my heart unto every work that is done under the sun: there is a time wherein one man ruleth over another to his own hurt. (Ecclesiastes 8:9)

I applied mine heart to know, and to search, and to seek out wisdom, and the reason of things, and to know the wickedness of folly, even of foolishness and madness: (Ecclesiastes 7:25)

When I applied mine heart to know wisdom, and to see the business that is done upon the earth: (for also there is that neither day nor night seeth sleep with his eyes:) (Ecclesiastes 8:16)

I have seen the travail, which God hath given to the sons of men to be exercised in it. (Ecclesiastes 3:10)