Another quote from Keller's new study, The Gospel in Life:
"The gospel, if it is really believed, removes neediness -- the need to be constantly respected, appreciated, and well-regarded; the need to have everything in your life go well; the need to have power over others. All of these great, deep needs continue to control you only because the concept of the glorious God delighting in you with all his being is just that -- a concept and nothing more."
To overcome our "neediness", we need to labor in God's strength to let the truth of the gospel sink deep down into our hearts so that it dwells in us richly. To the degree that we're really gripped by Christ's love, we'll be unshakable even when these so-called "needs" are not being met.
O God, give us the grace to own the gospel as infinitely more than a bare concept!