United to Christ by faith, believers continue to need only Christ, faithfully proclaimed to them, in order to attain to fullness of maturity, assurance & understanding: which is an encouraging life of love, safe from error, and firm in faith.
Christ alone reconciles sinners to God, and presents them holy, blameless, and above reproach before him, all through persevering gospel faith --- no other remedy will ever be required.
Christ alone is supreme, able to reconcile sinners to God, and is the fount of all true wisdom and knowledge. You need to believe only in Him, a belief that will be manifest by ongoing obedience.
No matter the intensity of our delight, a life of faithful witnessing is still an everyday sacrifice which costs dearly though unworthy to be compared to future glory.