A Genuine Christian

"A genuine Christian would be horrified at giving place to the delusion that the redemption of Christ is imperfect and inadequate, that His atoning blood is not sufficient to cleanse from sin, that it must be plussed with something from the creature.

And ought he not to be equally horrified at calling into question the reality and efficacy of the Spirit's work in regeneration, supposing it is not to be credited unless it is regularly confirmed by certain feelings of which we are the subjects?

Is it any less a sin to deny or even doubt the work of the Holy Spirit than it is to deny or doubt the sufficiency of the finished work of Christ?"
                   -  A. W. Pink