One thing I know: “He answered, ‘Whether he is a sinner I do not know. One thing I do know, that though I was blind, now I see'” (John 9:25).
One thing I do: “Brothers, I do not consider that I have made it my own. But one thing I do: forgetting what lies behind and straining forward to what lies ahead, I press on toward the goal for the prize of the upward call of God in Christ Jesus” (Philippians 3:13-14).
One thing I seek after: “One thing have I asked of the Lord, that will I seek after: that I may dwell in the house of the Lord all the days of my life, to gaze upon the beauty of the Lord and to inquire in his temple” (Psalm 27:4).
— Helen Roseveare
I encourage you to listen to the recording (link above).