To exult in something is to feel intense joy because of it. God is the overflowing source and giver of joy, and to believe in his Son Jesus includes rejoicing in who he is and what he's done.
The center of Christianity is that Jesus is our Savior. By this we mean that as sinful people, we deserve to die, and yet Christ, as our substitute, died the death we deserve and mercifully gives us the credit for his perfect life.
“By making disciples on the campus”
The way in which we express our joy in Christ is by laboring in the lives of other college students for their spiritual growth. Our goal is to make disciples, not just converts, and therefore we focus on depth as well as breadth.