FAITH

What it is? How It is?

And faith is the confidence with which things are expected (Promises), convinced even if you can not see them.

For in this were the elders testified of; by faith we understand the ages to have been prepared by a saying of  only Almighty God, in regard to the things seen not having come out of things appearing; by faith a better sacrifice did Abel offer to Almighty God than Cain, through which he was testified to be righteous, Almighty God testifying of his gifts, and through it, he being dead, doth yet speak. 

By faith Enoch was translated -- not to see death, and was not found, because Almighty God did translate him; for before his translation he had been testified to -- that he had pleased Almighty God well, but without faith it is impossible to please Almighty God, for it behooves him who is coming to Almighty God must believe that He is, and to those seeking Him Almighty God become a rewarder. 

By faith Noah, having been divinely warned concerning the things not yet seen, having feared, did prepare an ark to the salvation of his house, through which he did condemn the world, and of the righteousness according to faith he became heir. 
By faith Abraham, being called, did obey, to go forth to the place that he was about to receive for an inheritance, and he went forth, not knowing whither he doth go; by faith he did sojourn in the land of the promise as a strange country, in tabernacles having dwelt with Isaac and Jacob, fellow-heirs of the same promise, for he was looking for the city having the foundations, whose artificer and constructor is Almighty God.
By faith also Sarah herself did receive power to conceive seed, and she bare after the time of life, seeing she did judge Him faithful who did promise; wherefore, also from one were begotten -- and that of one who had become dead -- as the stars of the heaven in multitude, and as sand that [is] by the sea-shore -- the innumerable. In faith died all these, not having received the promises, but from afar having seen them, and having been persuaded, and having saluted [them], and having confessed that strangers and sojourners they are upon the earth, for those saying such things make manifest that they seek a country; and if, indeed, they had been mindful of that from which they came forth, they might have had an opportunity to return, but now they long for a better, that is, an heavenly, wherefore Almighty God is not ashamed of them, to be called their Almighty God, for Almighty God did prepare for them a city.
By faith Abraham hath offered up Isaac, being tried, and the only begotten he did offer up who did receive the promises, of whom it was said -- `In Isaac shall a seed be called to thee;'reckoning that even out of the dead God is able to raise up, whence also in a figure he did receive [him].
By faith, concerning coming things, Isaac did bless Jacob and Esau; by faith Jacob dying -- each of the sons of Joseph did bless, and did bow down upon the top of his staff; by faith, Joseph dying, concerning the outgoing of the sons of Israel did make mention, and concerning his bones did give command.
By faith Moses, having been born, was hid three months by his parents, because they saw the child comely, and were not afraid of the decree of the king;by faith Moses, having become great, did refuse to be called a son of the daughter of Pharaoh...

Hebrews 11