1) God demonstrated His love by sending His one and only Son, Jesus Christ, into the world so that all may live through Him. Jesus came to be the propitiation for our sins in order to appease God's wrath against sin.
2) If God has loved us in such a way by sending Jesus, believers must also love one another. Loving one another is how God remains in believers and perfects His love within them.
3) God's love empowers believers to love others. The appropriate response to God's love is for believers to love one another, which allows God to dwell within them and complete His goal of love.