It is staggering that God should love sinners; yet it is true. God loves creatures who have become unlovely and (one would have thought) unlovable. There was nothing whatever in the objects of his love to call it forth; nothing in us could attract or prompt it. Love among persons is awakened by something in the beloved, but the love of God is free, spontaneous, unevoked, uncaused. God loves people because he has chosen to love them and no reason for his love can be given except his own sovereign good pleasure.
–J. I. Packer
Follow this idea…
God chose to love us when we were unlovable.
God placed within us His Holy Spirit.
God has given us the power to love others with His compassion.
Therefore, we can choose to love others with compassion and patience, even though they are difficult.
God tells us: Turn the other cheek, go the extra mile… why? Because it is what God did for you. Now do it for others to show them who God is!