Simplicity and Purity of Devotion

Paul was concerned for the Corinthians and said, "But I am afraid...your minds should be led astray from the simplicity and purity of devotion to Christ" (2Cor.11:3). He was speaking to those who had heard of salvation by grace through faith in Christ. What sort of things lure those who know the truth (at least intellectually) away from the simplicity and purity of devotion to Christ? Familiarity with the truth so that it has little impact? Activity--so many things competing for our attention and affection? Pride--an elevated view of self that makes us think our involvement and input in any number of things is so valuable that we can not spare the time to focus on Christ? Love for the world--a quest for pleasure, possessions, power, popularity, and/or profit? Religiosity--the adherence to a long list of rules that defines our spirituality rather than the simplicity and purity of devotion to Christ? Lord help me see what lures me away and repent, run, and rid myself of it.