Eis and conditions
When the greek preposition eis stands between a command and a blessing, it always makes the command essential to that blessing. An induction of instances where the preposition eis and salvation, or its equivalent occur, demonstrates vividly this fact:
Believe.........EIS...righteousness ...(Romans 10:10)
Repent..........EIS...Life.............. (Acts 11:18)
Confess.........EIS...Salvation .......(Romans 10:10)
Baptized........EIS ..In Christ....... (Romans 6:3-4)
Repent and
be baptized EIS...remission of sins (Acts 2:38)