If you believe that once you are gifted with the Holy Spirit you are can never deny GOD; you are also saying there is no such thing as the unforgivable sin which Jesus himself taught us is possible.
Matthew 12:31 Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. 32 And whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.
Matthew 12:31 Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. 32 And whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.
First off, no one was filled AND sealed with the Holy Spirit until Jesus' death, resurrection, and ascension. The Holy Spirit came UPON people, but did not permanently indwell and SEAL them with His Presence.
The warning is to those who AREN'T, or maybe just THINK they are saved,