Holier Than Thou - Biblical Contradictions

How old was Jehoiachin when he became king of Judah and how long did he reign?

2 Kings 24:8, "Jehoiachin was eighteen years old when he became king, and he reigned in Jerusalem three months. His mother's name was Nehushta daughter of Elnathan; she was from Jerusalem."

2 Chronicles 36:9, "Jehoiachin was eight years old when he became king, and he reigned in Jerusalem three months and ten days."

According to 2 Kings chapter 24, Jehoiachin was 18 years old when he became king and he reigned in Jerusalem three months, however, according to 2 Chronicles chapter 36, he was 8 years old when he became king and he reigned in Jerusalem three months and ten days."

"Sorrow is better than laughter: for by the sadness of the countenance the heart is made better. The heart of the wise is in the house of mourning; but the heart of fools is in the house of mirth." (Ecclesiastes 7:3-4, KJV)

"Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be merry: for that shall abide with him of his labour the days of his life, which God giveth him under the sun." (Ecclesiastes 8:15, KJV)