.. [T]he kingdom of God the one thing that qualifies us is knowing that we don’t, and the one thing that disqualifies us thinking that we do. In other words, all we need is to know our need. To put it briefly, the only thing to offer is the single statement: ‘I have nothing to offer.’
Quoted from Ortlund, D. C. (2011). Defiant grace: The surprising message and mission of Jesus. Darlington, England: EP Books, p. 37.