I have a number of disagreements with Barth theologically and ethically, but he did often speak truth. This quote from his book Homiletics he expresses well the how essential it is for us to love the people to whom we preach. Without this love it all falls apart.
“Preachers must love their congregations. They must not want to be without them. They have to realize: I am part of them, and I want to share with them what I have received from God. It will not help to speak with the tongue of men or angels if this love is missing.” (Cited in Preaching with All You’ve Got, David Day, p. 17)
If your theology is better than Barth’s, will your practice be less?