"But seek his Kingdom, and these things will be given to you as well", Luke 12:31

Jesus, teach to us the mysteries of the Kingdom. The expression:"But seek his kingdom, and these things will be given to you as well", Luke 12:31; is insert within a longer narrative that show to us the characteristics of the Kingdom of God.
The Kingdom of God is:
1) The happy life, the beatitudes Matthew 5:1-12
2) Salt and light of the earth (Truth and Wisdom), Matthew 5:13-16
3)Mercy and forgiveness, Matthew 21-26
4) Fidelity, Firmness Matthew 27-30
5)Perseverance, Matthew 33-37
6)Love for the good, the love perfected by the nature of the good, "love your enemies", Matthew 43-48
7)Devotion: No one can serve two masters, Matthew 5:24
8) Trust in God (Divine Providence), Matthew 5:25-34
The kingdom of God is an ethical doctrine that we can know through the description of his own characteristics. And ending as a summary: "Be Perfect as your heavenly father is perfect", Matthew 5:48.

Everyone will be salted with fire, Mark 9:49

Jesus Christ begins his teachings with the sermon of the mountain, with the beatitudes (Matthew 5:3-12 and Luke 6: 20-23), the beatitudes are promises, perfections, excellencies and respond to the desire for the good (wisdom).
Some of these promises are very specific: "Blessed are the pure in heart, for they shall see God" (Matthew 5: 8). What does it mean to see God? In eternal life: This is the eternal life, that they may know you the only true God. John 17: 3.
After the teaching of the beatitudes, there is a dialogue between Christ and his disciples: "Jesus said to Simon Peter: Simon, son of John, do you Agape me more than these? Yes, Lord, you know that I Philia you", John 21: 15-16
This is a dialogue between two levels of love, one "Agape", the spiritual love, the love projected towards to all the work of God; in the other hand "Philia", the love that is born of the pleasure of seeing us reflected in the others, the love of friendship.
After this dialogue Christ promises them the holy spirit, promises the Gnosis:
"Everyone will be salted with fire" Mark 9:49
The salt symbolizes the wisdom of god, the fire the energy of god. This promise will be realized in Pentecost: Acts of the Apostles 2
http://www.quintoevangelio.com.ar/en/articles/item/49-gnosis.html

The Spiritual Gift of Rectitude

Living in communion: The Parable of the Good Samaritan: Luke 10:25-35
On one occasion an expert of the Law stood up to test Jesus. Teacher he asked: "What must I do to inherit the eternal life?"
What is written in the Law? he replied. How do you read it?
He answered: "Love your Lord your God with all your heart and with all your soul and with all your strength and with all your mind", and, "love your neighbor as yourself".
You have answered correctly, Jesus replied: Do this and you will live.
But he wanted to justify himself, so he asked Jesus: and who is my neighbor?
Jesus said: "A man was going down from Jerusalem to Jerico, when he was attacked by robbers. They stripped him of his clothes, beat him and went away, leaving him half dead. A priest happened to be going down the same road, and when he saw the man, he passed by on the other side. So too, a levite, when he came to the place and saw him, passed by on the other side. But a Samaritan, as he traveled, came where the man was, and when he saw him, he took pity on him. He went to him and bandaged his wounds, pouring on oil and wine. Then he put the man on his own donkey, brought him to an inn and took care on him. The next day, he took out two denarios and gave them to the innkeeper. "look after him", he said: "and when I return I will reimburse you for any extra expense you may have"

In this practical case of the good samaritan we have two choices: the sin or the golden rule: "Do unto others as you would have them do unto you" this is also known as rectitude or imitate Jesus. This rule is the definition of the ethical behavior. The goal of rectitud is the communion, the life in common with God and the neighbor. We choose between good and evil, there is no term for Justice or the commandments, the sin (living according to the flesh) and the rectitude (lifing according to the spirit) are lifestyles, that bear fruits: the fruits of the spirit (Galatians 5:22-23) or the works of the flesh (Galatians 5: 19-21).

http://www.quintoevangelio.com.ar/en/articles/item/277-ethical-behavior.html