Cornelius a Lapide interprets this verse as, He that finds his life (ψυχὴν), which is, "the corporeal safety of life, when in peril of death, through denial of the faith", that such a person will lose his soul (ψυχὴν), i.e., the eternal salvation of his soul.
Cornelius a Lapide translates this verse as, He who finds his existence (psychē), meaning "the bodily security of life," when in danger of death due to the denial of faith, will lose his spirit (psychē), i.e., the eternal salvation of his soul.