How do we know Christ is the only one needful?

The sermon emphasizes that as all humans are destined to die, what matters most is one's spiritual state beyond physical life. Ecclesiastes 3:19 confirms that all men, regardless of their status, face death. To navigate this reality, one requires spiritual life and perfect righteousness, both of which are found exclusively in Christ. Jesus' redemptive work on the cross secures righteousness for His people, fulfilling the criteria necessary for their salvation. Therefore, Christ is relegated as the singular focus in the journey of faith, as true fulfillment and salvation can only be found through Him.