I am come a light into the world, that whosoever believeth on me should not abide in darkness.
John 12:46 (KJV)
Jesus has come to set us free from darkness. Believing on Him supplies us with the power and ability to break free from the bondage of sin, sickness, poverty and depression, and to lay hold boldly of the victory He has made available. His finished works have provided what we need; our believing on Him is how we take possession of what has been provided.