Matthew 12:29 says, Or else how can one enter into a strong man’s house, and spoil his goods, except he first bind the strong man? and then he will spoil his house.   I believe that Jesus was asking how He could cast out devils, if He did not first bind Satan.  God has allowed Satan to have certain power in the world, but he has already been bound for those who put their faith in Jesus.  The only power that Satan has over those who follow Christ by faith is the power we grant him by our own self will.  Satan, or the Devil, can never make us do anything.  In verse thirty Jesus declares, He that is not with me is against me; and he that gathereth not with me scattereth abroad.  There really is no neutral ground with Jesus. We are either for Him, or we are against Him.  Those who profess neutrality about Jesus have made their stand as being against Him.  Verse thirty-one states, Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men.  We sometimes hear people speak about unpardonable sin, but Jesus says there is only one, and that is blasphemy against the Holy Ghost.  Blasphemy is attributing the works of God to the Devil or any other source, and that is what the Pharisees had attempted to do when Jesus cast out devils.  The ultimate blasphemy is attributing the work of Jesus to anything other than His bringing salvation to people under the power of the heavenly Father.  If we do not accept this fact by faith, then there is no forgiveness.  Verse thirty-two declares, And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.  Jesus tells us that people can be forgiven for speaking against Him, but not for speaking against the Holy Ghost.  I believe that this is because once we accept Jesus as our Savior and Lord, at which time those times we spoke against Him are forgiven, the the Holy Spirit indwells us to guide us.  If we then speak against the Holy Spirit, we are deliberately sinning.  Verse thirty-three states, Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit.  Jesus says that a good tree bears good fruit, and a bad tree bears bad friut, and the tree is known by its fruit.  The analogy was about people.  If we are good, or have put our faith in Christ as Savior and Lord, then we will do things that bring honor to God.  If we are bad, or have not accepted Christ, then we cannot bring honor to God.  It is not enough to simply claim to follow Christ, but we if we are truly His, we must bear good fruit for Him.  Our fruit, or actions, will show the truth of our faith.  Verse thirty-four declares, O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.  Jesus called those around Him, which were still mostly those who professed to be God's people, a generation of vipers and asked how they could speak good things.  Jesus further said that what they felt in their hearts determined what they said.  This is still true today.  Verse thirty-five says, A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things.  Jesus tells us that the way we believe will determine the way that we act in life.  If God and His will are at the center of our lives, the things we do will be good and bring glory to Him.  The opposite is also true.  Anytime we act from self will or any influence other than we will of God, we cannot bear good fruit.  Verse thirty-six says, But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment.  We will be held accountable for every word we speak.  I believe that this goes even further than the actual speaking, but also to our attitude when we speak.  We may say the right words without them having any meaning.  Verse thirty-seven says, For by thy words thou shalt be justified, and by thy words thou shalt be condemned.  I believe that the only words that we can be justified by are a true proclamation of Jesus Christ as Savior and Lord, and then all that we say should be guided by the Holy Spirit.