There are rewards of us being sanctified. For one, our lives will be more productive and will display faithfulness and fruitfulness. Look up 2 Peter 1:2-10. In verse 2 it mentions that our grace and peace will be multiplied. In verse 3 it mentions that we will know the sufficiency of God. In verse 5-7 it mentions that we will experience spiritual growth. In verse 8 it mentions that we will be productive and fruitful. In verse 10 it mentions that we will not fall into sin as often.