At TGC Netherlands 2023, Collin Hansen examines Tim Keller's life and ministry through the concept of "rings on a tree," revealing the different influences that shaped Keller as a believer and pastor. Hansen describes how Keller held an inspiring commitment to lifelong learning and spiritual formation, even in the face of illness, and how Keller's final years were marked by a deep focus on eternity, as he searched for a deeper communion with God and prepared for his own death. Hansen also highlights how a strong sense of community, diverse mentors, and a deep love for the gospel all shaped the influential legacy of Tim Keller.