Simplify the following text for a Grade 7 native English-speaking person.
Original: Piper believes in justification by faith alone apart from works , and his teachings emphasize the need for the active perseverance of the believer in faith , sanctification , and enduring sufferings , as this is evidence of God 's saving grace .
Simplified: Piper believes in justification by faith alone apart from good works . His teachings talk about the need for the Christian to have faith , sanctification , as this is evidence of God 's saving grace .