The sufficiency is not generated by the sheep. It is guaranteed by who is leading. That single distinction changes everything about how you move through a day.
David wrote Psalm 23 as a man who had actually been a shepherd. He knew what it meant to lead something that could not survive without guidance. When he wrote 'the Lord is my shepherd' he was not reaching for a metaphor. He was writing from the inside of one.
Nothing can surprise the shepherd. I shall not want is not a resolution — it is the certainty of someone who knows who is leading them. The gold line running through the 23 is the axis of that certainty. The sheep does not need to know where north is.
David wrote this psalm. The man who slew Goliath, who led armies, who became king, who sinned deeply and wept bitterly, who knew the valley of the shadow of death—and feared no evil. This is not a psalm from someone who has never suffered. It is a psalm from someone who has suffered—and still says: he is my shepherd.