There is so much in the world today which threatens to seduce the church from faithfulness to her heavenly bridegroom, and to distract her from essentials. I do not doubt that Paul, were he here in person today, would address to us the very same words that he addressed to the Christians in Corinth: "I am afraid that, as the serpent deceived Eve by his cunning, your thoughts will be led astray from a sincere and pure devotion to Christ" (2 Cor 11:3). We all need constantly to be brought back to this personal devotion, this "one thing" which Martha had not learned but Mary had, and which Jesus said was not to be taken away from her (Lk 10:38-42)...
And all of us, whether pastors or people, need to recover something of the passion for Christ which has animated the saints in every age. I take two Scottish divines as my example. Andrew Bonar wrote in his journal: "My soul's cry is still for more acquaintance with the Lord Jesus, and the Father in him." And the same Bonar wrote at the end of his sketch of Samuel Rutherford: "Oh for his insatiable desires Christward! Oh for ten such men in Scotland to stand in the gap!--men who all day long find nothing but Christ to rest in, whose very sleep is pursuing after Christ in dreams."
If Christ were at the center like that, an ailing church would quickly regain its health, and ailing Christians their vitality. For the principal thing is simply this, that we focus on Christ.