This is not an easy verse to understand.  Although there is a similar statement in Matthew 12:31-32 and Mark 3:29-30, the context of those verses is of people who attributed the work of God to the power of Satan.  In Luke's account, the context is of the contrast between those who stand up for Jesus or who disown Him.  Yet, Luke records Jesus as saying that forgiveness is possible even for Peter who was going to disown Him (Luke 22:32) - and He prayed for His executioners to be forgiven when He was on the cross (Luke 23:34).

Many families have been divided over money.  On this occasion, a man who believed he had been unfairly cheated out of his inheritance appealed to Jesus to make his greedy brother share the money or land.  But Jesus refused.  It was not His job to be a judge because He had come to be a Saviour (John 12:47).  This complaining man was in greater danger than he realised. ‘It is you who needs to watch out’, Jesus said, ‘Your life is not measured by what you possess!’  

Worry is a chronic fear.  It is not bad enough to paralyse thoughts and decisions; instead, it takes over the horizon of the mind and makes everything else revolve around it - creating stress and displacing other priorities.

Everybody needs to eat and drink.  Although God knows that very well and has amazing ways of providing for our basic needs, many Christians worry that they might not have enough.  Of course, worry is always about the future.  Because we can never see tomorrow it is easy to fall to the temptation that the next day will bring disaster. That is Satan's lie; it cannot be true because God has promised to work all our circumstances together to produce goodness (Romans 8:28).