Paul uses the phrase “one thing” to bring focus and clarity to his calling. This phrase appears five times in the New International Version of the Bible—once in the verse above in Philippians and four times in the Gospels:
In Luke 10:42, Jesus says to Martha, “only one thing is needed.”
In both Luke 18:22 and Mark 10:21, Jesus tells the rich man that he still lacks “one thing.”
In John 9:25, the blind man who was healed by Christ tells the Pharisees, “One thing I do know. I was blind but now I see!”