Faith

In Luke 7:1-10 we see an example of how Jesus reacts to the faith of others, He is overjoyed and praises the Centurion who displays such great faith:"7 After he had finished all his sayings in the hearing of the people, he entered Capernaum. ² Now a centurion had a servant^a]">[a] who was sick and at the point of death, who was highly valued by him. ³ When the centurion^b]">[b] heard about Jesus, he sent to him elders of the Jews, asking him to come and heal his servant. ⁴ And when they came to Jesus, they pleaded with him earnestly, saying, “He is worthy to have you do this for him, ⁵ for he loves our nation, and he is the one who built us our synagogue.” ⁶ And Jesus went with them. When he was not far from the house, the centurion sent friends, saying to him, “Lord, do not trouble yourself, for I am not worthy to have you come under my roof. ⁷ Therefore I did not presume to come to you. But say the word, and let my servant be healed. ⁸ For I too am a man set under authority, with soldiers under me: and I say to one, ‘Go,’ and he goes; and to another, ‘Come,’ and he comes; and to my servant, ‘Do this,’ and he does it.” ⁹ When Jesus heard these things, he marveled at him, and turning to the crowd that followed him, said, “I tell you, not even in Israel have I found such faith.” ¹⁰ And when those who had been sent returned to the house, they found the servant well."
And from the Canaanites came a woman who displayed similar faith.
 
Then Jesus went thence, and departed into the coasts of Tyre and Sidon. ²² And, behold, a woman of Canaan came out of the same coasts, and cried unto him, saying, Have mercy on me, O Lord, thou son of David; my daughter is grievously vexed with a devil.
²³ But he answered her not a word. And his disciples came and besought him, saying, Send her away; for she crieth after us.
²⁴ But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
²⁵ Then came she and worshipped him, saying, Lord, help me.
²⁶ But he answered and said, It is not meet to take the children's bread, and to cast it to dogs.
²⁷ And she said, Truth, Lord: yet the dogs eat of the crumbs which fall from their masters' table.
²⁸ Then Jesus answered and said unto her, O woman, great is thy faith: be it unto thee even as thou wilt. And her daughter was made whole from that very hour.(Matthew 15:21-28)
Jesus recognizes her faith and heals her child gladly, He recognizes and praises the faith of the Centurion and heals his servant.
In order to truly be a disciple of Christ it is paramount to cultivate a strong and healthy faith.  Jesus tells us:
And Jesus rebuked the devil; and he departed out of him: and the child was cured from that very hour.
¹⁹ Then came the disciples to Jesus apart, and said, Why could not we cast him out?
²⁰ And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.(Matthew 17:18-20)
Jesus is telling His Apostles they could work the same miracles as He if they have even a little bit of faith.  If it is true of them it is also true for us.
There is another story in the Gospels where Peter is summoned by Jesus as Jesus walks on the waters just outside of Peters boat.  Peter makes it out but as he gets closer to Christ he begins to sink and almost drowns.
²⁸ And Peter answered him and said, Lord, if it be thou, bid me come unto thee on the water.
²⁹ And he said, Come. And when Peter was come down out of the ship, he walked on the water, to go to Jesus.
³⁰ But when he saw the wind boisterous, he was afraid; and beginning to sink, he cried, saying, Lord, save me.
³¹ And immediately Jesus stretched forth his hand, and caught him, and said unto him, O thou of little faith, wherefore didst thou doubt?(Matthew 14:22-31)
Faith is rewarded and praised by Christ.  Jesus says if we have even a miniscule amount of faith we can move mountains.  With faith we can part the Red Sea or walk on water, we can heal the blind or cleanse the leper.  
Or more importantly, with faith, we can overcome the obstacles in daily life or the obstacles throughout our lives so that we not only survive but prevail.
Faith that there is justice in the universe, faith that we will prevail, faith that Family is forever is the keystone that makes life worth living.  It is what let's us know we are loved, we are cared for, we are significant to The Lord. 
It is the key that unlocks the ability to act in Christ's stead.
It is what tells us that eternal justice somewhere means there is true justice everywhere.