Peter has just told the believers to resist the devil and be strong.
## for a little while ##
"for a short time"
## God of all grace ##
"God who is completely kind"
## who called you to his eternal glory in Christ ##
"who chose us to share his eternal glory in heaven because we are joined to Christ" (UDB)
## perfect you ##
"restore you"
## establish you ##
"set you securely"