The fulfilment of righteousness requires the wisdom of God.
At the age of twelve (12), Jesus went to the Passover feast in Jerusalem with His parents [Joseph and Mary], where He spoke in a way that caused the elders in the temple realise the wisdom of God that was within Him. At that tender age, He had already sucked the teaching [the Father’s Word] in Himself. This was before His fixed date of the Father, meaning the beginning of His ministry and before the age of thirty (30).
