{h} I the Preacher was king over Israel in Jerusalem.

(h) He proves that if any could have attained happiness in this world by labour and study, he should have obtained it, because he had gifts and aids from God to it above all others.

Wesley's Notes

1:12 I was king - Having asserted the vanity of all things in the general, he now comes to prove his assertion in those particulars wherein men commonly seek, and with greatest probability expect to find, true happiness. He begins with secular wisdom. And to shew how competent a judge he was of this matter, he lays down this character, That he was the preacher, which implies eminent knowledge; and a king, who therefore had all imaginable opportunities and advantages for the attainment of happiness, and particularly for the getting of wisdom, by consulting all sorts of books and men, by trying all manner of experiments; and no ordinary king, but king over Israel, God's own people, a wise and an happy people, whose king he was by God's special appointment and furnished by God, with singular wisdom for that great trust; and whose abode was in Jerusalem where were the house of God and the most wise and learned of the priests attending upon it, and the seats of justice, and colleges or assemblies of the wisest men of their nation. All these concurring in him, which rarely do in any other men, make the argument drawn from his experience more convincing.

Jamieson-Fausset-Brown Bible Commentary

12. Resumption of Ec 1:1, the intermediate verses being the introductory statement of his thesis. Therefore, "the Preacher" (Koheleth) is repeated.

was king-instead of "am," because he is about to give the results of his past experience during his long reign.

in Jerusalem-specified, as opposed to David, who reigned both in Hebron and Jerusalem; whereas Solomon reigned only in Jerusalem. "King of Israel in Jerusalem," implies that he reigned over Israel and Judah combined; whereas David, at Hebron, reigned only over Judah, and not, until he was settled in Jerusalem, over both Israel and Judah.

Matthew Henry's Concise Commentary

1:12-18 Solomon tried all things, and found them vanity. He found his searches after knowledge weariness, not only to the flesh, but to the mind. The more he saw of the works done under the sun, the more he saw their vanity; and the sight often vexed his spirit. He could neither gain that satisfaction to himself, nor do that good to others, which he expected. Even the pursuit of knowledge and wisdom discovered man's wickedness and misery; so that the more he knew, the more he saw cause to lament and mourn. Let us learn to hate and fear sin, the cause of all this vanity and misery; to value Christ; to seek rest in the knowledge, love, and service of the Saviour.