When a Christian lives the wrong way, we grieve the Holy Spirit who dwells within us. There is the sin of blasphemy against the Holy Spirit, the unforgivable sin, and there is a lot of confusion about what the unforgivable sin is. The unpardonable sin is finally and ultimately saying, “No” to Jesus, rejecting faith in Jesus Christ. That’s the unpardonable sin, blasphemy against the Holy Spirit. If you are a born-again Christian, you have not committed that sin and you can never commit the unpardonable sin, so just put your mind at rest.