What was Paul thinking when he wrote to the Philippians that in "nothing" be anxious?

Phil 4: 4-6
​4 Rejoice in the Lord always: and again I say, Rejoice.
5 Let your moderation be known unto all men. The Lord is at hand.
6 Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
7 And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.

This passage was not a denial of reality, but it is a reminder to the disciples in Philippians of what affirms their new reality in Christ Jesus. 

2 Corinthians 5:17
7 Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.

For anyone who is settled in Christ, there is a new Lordship, a new master. This master is Christ Jesus our saviour and our Lord. 

We studied the book of Exodus Chapter 14 and 15, here we can see the lives of the Israelite as they journeyed through the wilderness and how they simply lost sight of God, we also looked at how this still happens today in our own generation.

Romans 8:28 - "And we know that all things work together for good to them that love God, to them who are the called according to his purpose." (KJV)
​
(AMPC) - We are assured and know that [God being a partner in their labour] all things work together and are [fitting into a plan] for good to and for those who love God and are called according to [His] design and purpose.

God has a plan and an original purpose fr everyone, Jesus did not come so that we can live in big houses an mansions and t show to the world that we have riches. God gave up Jesus to die on the cross for us just for us o have many other unbelievers have. If Christ came for our earthly blessing, then we are the most miserable of all.
​
There is a place for us to trust God and to let His hands Guide us to his divine plan.

The Children of Israel lamented over the onions and garlic they left behind when they were captives in Egypt, but this is a major shortsightedness, a misunderstanding of the purpose why they were saved from captivity of the Egyptians. This behaviour points out to their lack of trust for God and hence they do not believe God or have surrendered to Him or His will.

The issue is that many of us still live like the Israelite behaved to God. And we saw that though God's plan for each of Israelite was good and God planned to fulfil all he promised, but due to their unbelieve, non of them actually saw the promised land.

It is possible to have God's promise in our hands but if our believe does not translate into actions that stands as a proof that we trust God and believe in Him, without a doubt that His word is for us and He will fulfil them, we can still loose that great promise.

God has promised us salvation but only through Jesus. Do you believe? Then Where is your proof?
2 timothy 2:19 - "Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, Let every one that nameth the name of Christ depart from iniquity."