John Ortlund writes in his excellent commentary on Isaiah regarding Isaiah 55:6-7:

“We’ve forgotten that Christianity is so contrary to our ingrained likes and dislikes, it requires nothing less than transformation of the magnitude of a religious conversion. We American Christians can’t just tweak our American ways and American thoughts. We can’t just “make a decision for Christ” and leave it at that. We can’t join a certain church because it won’t challenge our selfish lifestyle and think that’s Christianity. Being nice, harmless, church-going people, with no repentance, no submission, no forsaking of self, no pursuit of Christ – but all that covered over with a glaze sentimental religion on Sunday mornings – this is not at all what God has in mind for us.”