This is faith to live by your spiritual knowledge, assurances, and revelation.

I started reading Matthew chapter 8 per the schedule of "Come, follow me." If God were living on Earth, would you ask him to bless one of your loved ones? I think that this would be as natural as prayer. The following story impressed me: 

"And when Jesus was entered into Capernaum, there came unto him a centurion, beseeching him, And saying, Lord, my servant lieth at home sick of the palsy, grievously tormented. 
And Jesus saith unto him, I will come and heal him. 
The centurion answered and said, Lord, I am not worthy that thou shouldest come under my roof: but speak the word only, and my servant shall be healed. For I am a man under authority, having soldiers under me: and I say to this man, Go, and he goeth; and to another, Come, and he cometh; and to my servant, Do this, and he doeth it. 
When Jesus heard it, he marvelled, and said to them that followed, Verily I say unto you, I have not found so great faith, no, not in Israel. And I say unto you, That many shall come from the east and west, and shall sit down with Abraham, and Isaac, and Jacob, in the kingdom of heaven. But the children of the kingdom shall be cast out into outer darkness: there shall be weeping and gnashing of teeth. And Jesus said unto the centurion, Go thy way; and as thou hast believed, so be it done unto thee. And his servant was healed in the selfsame hour." (Matthew 8:5-13)

The centurion knew Christ can heal his servant, and he asked him to do so. The miracle would not have happened, if he had not asked. This is faith to live by your spiritual knowledge, assurances, and revelation. 

I tend to write a lot about this because an accounting teacher taught what faith really is. Faith is so abstract according to the general understanding of society that the teacher's explanation of the true understanding was enlightening. Faith is a principle to live by; not a general belief. We live it by trusting in the word and revelation that God gives man. I trusted that he would provide for me, so I worked at it to let him provide my current life situation including my career and family. That is one example of practicing faith.