Do we need more of the Holy Spirit?

Do we need a second portion of the Holy Spirit after salvation? Does Paul say we might lose our salvation because of coarse jesting? My son thinks we might be saved by works. What can I share with him? Do we celebrate communion in order to be forgiven by God?

Tags: coarse jesting, communion, faith, Holy Spirit, remembrance, salvation, second baptism, second blessing, second portion, works