Jesus and the rich young ruler
(Attribution unknown)
Why is Jesus Christ the Lord of the whole world?
Jesus Christ is Lord of the world and Lord of history because everything was made for his sake. All men were redeemed by him and will be judged by him.
He is over us, and the only One to whom we bend the knee in worship; he is with us as Head of his Church, in which the kingdom of God begins even now; he is ahead of us as Lord of history, in whom the powers of darkness are definitively overcome and the destinies of the world are brought to perfection according to God's plan; he comes to meet us in glory, on a day we do not know, to renew and perfect the world. We can experience his nearness especially in God's Word, in the reception of the sacraments, in caring for the poor, and wherever "two or three are gathered in my name" (see Mt 18:20). (YOUCAT question 110)
Dig Deeper: CCC section (668-674) and other references here.