Answer:
Knowledge, wealth and reputation.
Step-by-step explanation:
Three things through which Solomon sought happiness were knowledge, wealth and reputation.
King Solomon in an attempt to find happiness on this earth tried many experiences. However, all of them proved to be futile and adequate as compared to God's love and blessings.
Christians can learn from king Solomon's experiences that even the most powerful and richest man on earth failed to find happiness under the sun/on this earth. It is only through God's presence and love that one can achieve truest happiness.