Referring to the great Temple of God, which King David so earnestly hoped to build, he said:
“ONE THING HAVE I DESIRED of the Lord; that will I seek after; that I may dwell in the house of the Lord all the days of my life, to behold the beauty of the Lord, and to enquire in His temple” (Psa.27:4).
Similarly, when Martha of Bethany complained to Jesus that Mary “sat at [His] feet and heard His Word” while she was left to serve alone, the Lord answered:
“Martha, Martha, thou art careful and troubled about many things, but ONE THING IS NEEDFUL, and Mary hath chosen that good part, which shall not be taken away from her” (Luke 10: 41,42).
Today, with regard to the message of grace from the ascended, glorified Lord, the Apostle Paul exhorts us: “Let the Word of Christ dwell in you richly” (Col.3:16). Wonderful results follow such a determination to know Christ through the Word.
When the Lord Jesus opened the eyes of the blind beggar, the poor man was immediately persecuted by the religious leaders of the day. He could not answer all of their questions but he could answer the one most important to himself:
“ONE THING I KNOW, that, whereas I was blind, now I see” (John 9:25).
The rest of the narrative relates how the blind beggar also received spiritual sight as, face to face with the Son of God, he exclaimed: “Lord, I believe! …and…worshipped Him” (John 9:38).
But what about our conduct after spiritual sight has been bestowed? The most consecrated believer will acknowledge that he often fails to live up to the light he has received. St. Paul, by inspiration, gives us the solution to this problem also, saying:
“THIS ONE THING I DO: forgetting those things which are behind, and reaching forth unto those things which are before, I press [strain] toward the goal for the prize of the high calling of God in Christ Jesus” (Phil. 3:13,14). source