A few thoughts as follows…
“Poor in spirit” Chapter 5:3 This sounds puzzling. Obviously our Lord doers not mean that the person who is spiritually disinterested will be blessed. My sense has always been that the person in question is deeply longing for a more spiritual life and longing to live in and among others who think in spiritual terms. Think of it this way: we are living in this sinful world in a spiritual ghetto and we really long to be in spiritual paradise. Cross reference “thirsting for righteousness” in verse 6.
“Do not be anxious about your life….” Matthew 6:25-27 This is hard for us to grasp in an age when check our annuities and spreadsheets daily! But the Lord Jesus has just finished saying “You cannot serve both God and money” [verse 24] and he concludes by saying “Seek first the Kingdom of God…etc.” So…I think he is saying, as the Old Testament says Proverbs 23:4 (NIV) ” Do not wear yourself out to get rich; have the wisdom to show restraint.” The Christian can plan and should be wise but should not make the accumulation of wealth his/her highest goal. We must be realistic with our needs and our anticipated upcoming needs But obsessing over our “stuff” will lead us away from trust in God. The Christian who has never experienced real need when the resources are lacking will never quite experience God in His “need Meeting” role.
“Be perfect as your Heavenly Father is perfect” Matthew 5:48. Re-read the preceding verses….43 thru 47. Jesus is saying we should be “just like” our Heavenly Father when it comes to being good to those who do not deserve it because that is what HE DOES! Jesus is not expecting total moral perfection but simply obedience in the matter of kindness to others even if they are not kind to us. Think of it this way: “Imitate your Heavenly Father perfectly when it comes to your actions with those who do not bless you!”