1. A neglect of prayer. 'A negelcted closet is the cause of all spiritual decline.'
2. Idolatry. 'The heart has been occupied with something else, more than with God.'
3. Self confidence and self righteousness. 'Pride is busy in the heart'
Not an exhaustive list no doubt, and each point needs careful unpacking. Indeed I'm only too aware of patients who self diagnose on the basis of an internet search. But it's a good staring place to help us understand the coldness of our hearts. Think about it, chat these three through with an older wiser believer and...
'do not rest satisfied with wishing for a return to former happiness, but go at once to seek your Master and tell him your sad state.....Do not sit down to sigh and lament, while the beloved Physician lives there is a certainty of recovery of the worst cases.' Spurgeon.