The number one is very important in the Word. Old and New Testaments proclaim, “Hear … the LORD our God, the LORD is one” (Deut. 6:4, Mark 12:29). Having a oneness in ourselves, in our hearts – a unity and oneness with God in relationship and love is the theme throughout. David asks God, “Unite my heart to fear Your name” (Psalm 86:11). James warns us not to be double-minded, but fixed, sold out.
Come near (be joined) to God and he will come near to you. Wash your hands, you sinners, and purify your hearts, you double-minded (wavering, uncertain, doubting, divided in interest). James 4:8 (NIV)
Marriage – the two becoming one – is a picture of this goal of oneness with God. So, idolatry, making anything more important than our relationship with God, is seen as adultery. We were made for this oneness, but our sin and rebellion has divided us from the One who loves us. Jesus came to show us the way back, to provide the way for this to happen. Paul wrote in his letter to Timothy, “There is one God and one Mediator who can reconcile God and humanity—the man Christ Jesus. He gave his life to purchase freedom for everyone” (1 Timothy 2:5-6 NLT).
Karl Rahner wrote of Jesus’ life and acts as a demonstration this one essential thing.
Therefore Jesus goes into the desert, therefore he fasts; therefore he leaves behind everything else that a man needs even for bare existence, so that for this once not just in the depths of his heart but in the whole range of his being he can do and say what is the first and last duty of humankind – to find God, to see God, to belong to God to the exclusion of everything else that makes up human life. And therefore he fasts. Therefore through this cruelly hard act, this denial of all comfort, this refusal of food and drink, through the solitude and abandonment of the desert, through everything else that involves a rejection, a self-denial of the world and all earthly company, through all these he proclaims this fact: one thing only is necessary, that I be with God, that I find God, and everything else, no matter how great or beautiful, is secondary and subordinate and must be sacrificed, if needs be, to this ultimate movement of heart and spirit.[i] (emphasis mine)
One thing only is necessary, that I find God, that I am one with Him – to see Him, to hear Him, to experience Him, to know Him.
One thing I ask of the LORD, this is what I seek: that I may dwell in the house of the LORD all the days of my life, to gaze upon the beauty of the LORD and to seek him in his temple. Psalm 27:4
To see God
“Martha, Martha,” the Lord answered, “you are worried and upset about many things, but only one thing is needed. Mary has chosen what is better, and it will not be taken away from her.” Luke 10:42
To hear God
One thing I do know. I was blind but now I see! John 9:25
To experience God
Brothers, I do not consider myself yet to have taken hold of it. But one thing I do: Forgetting what is behind and straining towards what is ahead, I press on towards the goal to win the prize for which God has called me heavenwards in Christ Jesus. Philippians 3:13-14
To know God
Everybody I know says they need just one thing
And what they really mean is that they need just one thing more
And everybody seems to think they’ve got it coming
Well I know that I don’t deserve You
Still I want to love and serve You more and more
You’re my one thing
Save me from those things that might distract me
Please take them away and purify my heart
I don’t want to lose the eternal for the things that are passing
‘Cause what will I have when the world is gone
If it isn’t for the love that goes on and on with
My one thing
You’re my one thing
One Thing by Rich Mullins https://www.youtube.com/watch?v=9aqP-A4tKCA
Image in the Public Domain: Mary Magdalene at the Feet of Jesus by James Tissot. In the Brooklyn Museum
[i] The Great Church Year, Karl Rahner.