The truth or falsity of profession may be proved by a single test: LOVE! "If any man love not the Lord Jesus Christ, let him be Anathema Maranatha" (accursed at His coming). 1 Cor. 16:22.
Love for (enjoyment of) God is not a human attainment. Only those transformed by saving grace into "new creatures in Christ Jesus" really love the Lord Jesus.
The charms of virtue, amiability, generosity, kindliness, considerateness, and other admirable qualities may yet lack love for the Lord Jesus.
Repeatedly the Word of God attributes to Saul of Tarsus: Human morality of the highest order; A religious profession; An outstanding personality; Unquestionable zeal and sincerity; The best of educational attainments; yet he was An enemy of the cross of Christ; Without a spark of love for the Lord Jesus; "A child of wrath" and needing imperatively the new birth.
Of one possessing exemplary characteristics, it is written, "Jesus beholding him loved him." Yet He must pronounce "one thing lacking," for the young man's departure manifested that love of riches―not love for Christ―swayed his soul.
"We love Him, because He first loved us.” 1 John 4:19.