The reason why we must hope in God is chiefly the fact that we belong to Him, as effect belongs to cause. God does nothing in vain, but always acts for a definite purpose. A cause that operates intellectually not only confers on the effect, in the act of producing it, all that is required for the result intended, but also, when the product is finished, controls its use, which is the end of the object.
St. Thomas Aquinas, from Light of Faith: The Compendium of Theology
My dad was a collector of old tools, many of which dated back a hundred years and more. When I was a kid I would play with them as he was tinkering in his garage, and he loved to make me guess what they were. After he explained them and their purpose, it seemed so obvious. “Oh yeah!” I would say, and that always made him laugh.
Your life’s purpose might seem a mystery to you. Maybe it isn’t obvious to your uninformed examination. Take it to the master builder, the One who created it.
He delights in showing you.
For I know well the plans I have in mind for you, says the Lord, plans for your welfare, not for woe! Plans to give you a future full of hope. When you call me, when you go to pray to me, I will listen to you. When you look for me, you will find me. Yes, when you seek me with all your heart, you will find me with you, says the Lord.