I shall succeed.
Psalm 23 : 1 - is about contentment
'The Lord is my shepherd, I shall not be in want.'
shall not want could also read 'I shall not fail, or lack'
out of the negative it becomes - I shall suceed, I shall posess
David is content because of the shepherd's care.
David calls Him my shepherd, the ultimate possession is the shepherd person Jesus Christ.
More shepherd stuff in the gospel of John ch10
The good shepherd devotes everything for the wellbeing of His 'sheep'
here is that wonderful agreement, You are all mine and I am all yours.
Discovering a harmonious union with Jesus Christ is contentment.