The Short version...

 And do not seek what you are to eat and what you are to drink, nor be worried. For all the nations of the world seek after these things, and your Father knows that you need them. Instead, seek his kingdom, and these things will be added to you. (Luke 12:29-31 ESV)
We are more familiar with the "seek ye first..." in Matthew's Gospel, but in the context of Jesus' talk on worry, this is concise and to the point:  being a believer and worrying are inconsistent with one another. His Kingdom is different than any worldly kingdom, even ones with benevolent dictators; our "job" is to trust; He will provide what we need. Whatcha gonna worry about now?

Sharper than Solomon...

 Consider the lilies, how they grow: they neither toil nor spin, yet I tell you, even Solomon in all his glory was not arrayed like one of these. But if God so clothes the grass, which is alive in the field today, and tomorrow is thrown into the oven, how much more will he clothe you, O you of little faith! (Luke 12:27-28 ESV)
The audience to which Jesus spoke may indeed had reason for concern about affording the basics of life, like clothing and food.  Here we are with competition in designer clothing worrying how we look when we go out.  But the worries are the same.  They focus on me having what I think I need, instead of trusting Him to provide what He knows I need.  If he provides such beauty for this temporal creation, how much more will he provide for the housing of our eternal souls. 

Wasting your time on worry...

 And which of you by being anxious can add a single hour to his span of life? If then you are not able to do as small a thing as that, why are you anxious about the rest? (Luke 12:25-26 ESV)
Jesus has just talked about the carefree life of the raven - fully depending on God's supply of food, like roadkill.  Most of us are beyond the Great Depression mindset of worrying about where our next meal will come from, but we do worry about our health - every little ailment seems like potential death. So we worry, which if anything takes days off of our lives.  Why do we worry? We are control freaks.  We want to be the ones to decide our destiny, including how long we live.  What Christ calls us to do is give control over to Him to trust Him with every day and every hour, and give us the full life He has planned.  He knows best; He wants the best. We can trust in Him.

Be a BIrd Brain!

 And he said to his disciples, “Therefore I tell you, do not be anxious about your life, what you will eat, nor about your body, what you will put on. For life is more than food, and the body more than clothing. Consider the ravens: they neither sow nor reap, they have neither storehouse nor barn, and yet God feeds them. Of how much more value are you than the birds!(Luke 12:22-24 ESV)
Jesus is in the process of telling us some important principles - foundational truths of the life of faith.  Anxiety and faith are in opposition to one another. Life is much more than the necessities of life. Even the birds know that. Their little bird brains are big enough to realize that God will provide - even the ones like the ravens who are scavengers. They don't worry like the rich farmer did about not having big enough barns; they depend on God to feed them.  We need that kind of brain, that kind of mindset - that we can trust God and not worry.

Bigger Barns can be Bad Business...

 And he told them a parable, saying, “The land of a rich man produced plentifully, and he thought to himself, ‘What shall I do, for I have nowhere to store my crops?’ And he said, ‘I will do this: I will tear down my barns and build larger ones, and there I will store all my grain and my goods. And I will say to my soul, “Soul, you have ample goods laid up for many years; relax, eat, drink, be merry.”’ But God said to him, ‘Fool! This night your soul is required of you, and the things you have prepared, whose will they be?’ So is the one who lays up treasure for himself and is not rich toward God.”(Luke 12:16-21 ESV)
In and of itself, this rich man had a good, practical solution to a problem: making sure his crop did not rot.  The real problem is that he was so focused on himself and clinging to stuff, and trying to control his own future, that he didn't even think about giving his excess to others and his time and energy to the things of the Lord.  What is on your mind today?  Maintaining your property? Buying more stuff? Setting yourself up for easy street? Or...Using your retirement years for missions work?  Setting aside some excess and asking God for whom and what to use it?  Spending some more time in Bible Study and prayer so you Know the decisions you are making are what God wants you to do?

There's more to life...

 Someone in the crowd said to him, “Teacher, tell my brother to divide the inheritance with me.” But he said to him, “Man, who made me a judge or arbitrator over you?” And he said to them, “Take care, and be on your guard against all covetousness, for one's life does not consist in the abundance of his possessions.”(Luke 12:13-15 ESV)
Many of us would willingly say "Jesus is Lord of all," and acknowledge that He will some day judge the world.  But this man seems to realize Jesus has the authority to judge NOW.  And He does. But often we don't like His decisions, as He is able to see past our actions to our motives, our greed, our desire for Him to rule in our favor even when we are being totally selfish. We gravitate towards greed.  Notice Jesus does not just answer Him, "he said to Them," to all of us: "Beware of every way you want things to serve you." 

Reasons to speak up...

 “And I tell you, everyone who acknowledges me before men, the Son of Man also will acknowledge before the angels of God, but the one who denies me before men will be denied before the angels of God. And everyone who speaks a word against the Son of Man will be forgiven, but the one who blasphemes against the Holy Spirit will not be forgiven. And when they bring you before the synagogues and the rulers and the authorities, do not be anxious about how you should defend yourself or what you should say, for the Holy Spirit will teach you in that very hour what you ought to say.” (Luke 12:8-12 ESV)
In this chapter Jesus shakes us up in a way we need it.  There's no just cruizin' along as His followers. If we expect Him to speak up and claim us as His, should we not be willing to speak up and claim Him as ours?  When the Holy Spirit moves us to speak up, should we reject His prompting.  Then He comes back to what He just said about fear; He knows us so well. We are afraid and anxious that we will get in a bind and not know what to say. Not to fear; the Spirit is here, to lead us in exactly what we need to say for each audience He brings our way.  We just need to be willing vessels and spokespersons for Him.