My observation of Christendom is that most of us tend to base our relationship with God on our performance instead of His grace. If we’ve performed well – whatever “well” is in our opinion – then we expect God to bless us. If we haven’t done so well, our expectations are reduced accordingly. In this sense, we live by works, rather than by grace. We are saved by grace, but we are living by the “sweat” of our own performance.
Moreover, we are always challenging ourselves and one another to “try harder.” We seem to believe success in the Christian life (however we define success) is basically up to us; our commitment, our discipline, and out zeal, with some help from God along the way. We give lip service to the attitude of the Apostle Paul, “But by the grace of God I am what I am” (I Corinthians 15:10), but our unspoken motto is, “God helps those who help themselves.”
– Jerry Bridges
as quoted by Tchividian, Tullian; One Way Love: Inexaustible Grace for an Exhausted World; David Cook Publishers; copyright 2013; Kindle Edition; Location 83