Make every effort to confirm your calling and election.

2 Peter 1:1-11
Grace and peace be yours in abundance through the knowledge of God and of Jesus our Lord.
For this very reason, make every effort to add to your faith goodness; and to goodness, knowledge; and to knowledge, self-control; and to self-control, perseverance; and to perseverance, godliness; and to godliness, mutual affection; and to mutual affection, love. But whoever does not have them is nearsighted and blind, forgetting that they have been cleansed from their past sins.
Therefore, my brothers and sisters, make every effort to confirm your calling and election. For if you do these things, you will never stumble, and you will receive a rich welcome into the eternal kingdom of our Lord and Savior Jesus Christ.
Why?
We are sharing the Grace of God and have his characters, so we should be live with faith to the Lord. Showing the behavior of God's people.
Confirm our calling and election in Jesus Christ.
Faith, goodness, knowledge, self-control, perseverance, godliness, mutual affection. This is the procedure of our life experience to accept God's glory.信心、德性，知識，節制、忍耐、敬虔，愛弟兄的心，愛眾人的心。
To be a real Christian have to make effort, to get the fruit of Spirit.
How?
Same as I am working hard, I have to make an effort to be Christian.