“All men seek happiness. This is without exception. Whatever different means they employ, they all tend to this end. The cause of some going to war, and of others avoiding it, is the same desire in both, attended with different views. This is the motive of every action of every man, even of those who hang themselves.” (Blaise Pascal)
Quote of a lesser known philosopher: “Everyone does what they want to do, then they find a reason or excuse for doing it.” My comment… the “reason or excuse” is what they believe will bring them the most joy and/or happiness as per Blaise Pascal above.
Scripture follow-up: “Seek ye first the kingdom of God and His righteousness and all these things will be added unto you” (Matthew 6:33). “Delight yourself in the Lord and He will give you the desires of your heart” (Ps 37:4. GOD is to be the desire of our heart). “In your presence there is fullness of joy; at your right hand are pleasures forevermore” (Ps 16:11).