When Paul wrote “I die daily” what did he mean? (All bold are my emphases added. Square brackets [ ] indicate meanings of words. King James Version Easy-Reading Bible (KJVER) used.)
1 Corinthians 15:31 I protest by your rejoicing which I have in Christ Jesus our Lord, I die daily.
Paul was discussing the sacrifices we as Christ’s disciples must make in serving Him. In the verses before this Paul is discussing that ultimately Christ will put His enemies under His feet (1 Corinthians 15:25, quoting Psalms 110:1). This cannot be finally fulfilled until the resurrection at Christ’s Second Coming, because Christ sits with the Father, on His right hand until all His enemies are put under His feet. Read 1 Corinthians 15:12-31.
1 Corinthians 15:26 The last enemy that shall be destroyed is death.
In the meantime, we labour for God, with the hope of the resurrection, else our labours are in vain.
1 Corinthians 15:29 Else what shall they do which are baptized for the dead, if the dead rise not at all? Why are they then baptized for the dead?
This is not teaching baptism for those who are dead yet unsaved, like some pagan Roman Catholic doctrine, but Paul is saying if those who are dead now, who were saved in life, but died in service to God, are not raised from the dead in the resurrection, then life is futile. So it would seem some people were baptized on their behalf, possibly because they died in the Lord before they could be baptised (by water) while alive. Death is extinguished in them because they were baptised into Christ. So in baptism (the outward sign of salvation) those dead have a remedy against death itself because baptism is symbolic of the resurrection to come. Their salvation was assured without the water though, like the thief on the cross (Luke 23:43).