Holier Than Thou - Biblical Contradictions

Was the seventh tribe of Israel Dan or Manasseh?

Genesis 49:16, "Dan will provide justice for his people as one of the tribes of Israel."

Revelation 7:6, "...from the tribe of Asher 12,000, from the tribe of Naphtali 12,000, from the tribe of Manasseh 12,000..."

According to Genesis 49:16, Dan was the seventh tribe of Israel, however, according to Revelation 7:6, Manasseh was the seventh tribe of Israel.

"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)