1 Peter 5:6-7

1 Peter 5:6-7 Humble yourselves therefore under the mighty hand of God, that he may exalt you in due time; casting all your anxiety upon him, because he careth for you.

Expanded Translation

You must be humble, submit, and lower yourselves therefore under the strong and powerful hand of God, in order that you might be elevated and exalted at the proper time, Throw all your worry and anxious care upon him, because he is concerned about your welfare and cares for you.

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Humble yourselves therefore

In view of the truth just statedthat the Almighty resists those who lift themselves up in arrogance and has blessings in store for the lowly.

casting all your anxiety upon him

The word anxiety (merimna) means literally to draw (the mind) in different directions. Those things which cause worry or anxious care must be cast upon our God! Many of such cares are concerning an impending or anticipated ill and the painful uneasiness of mind that comes from dwelling upon them. How easy it is to take these burdens upon ourselves, believing we can solve them! Even when the greatest calamity has befallen us let us say with Job, Jehovah gave, and Jehovah hath taken away; blessed be the name of Jehovah (Job 1:21).

As we have seen, the recipients of this epistle were already in the midst of tribulation and about to undergo trials of even greater intensity. If any group of Christians had the right to be anxious, they did. The apostle's exhortation was timely.
It appears that the Psalmist learned the lesson that Peter would here have us all heed, particularly concerning anxiety over our bodily safety.

I laid me down and slept.
I awaked; for Jehovah sustaineth me.
I will not be afraid of ten thousands of the people.
That have set themselves against me round about.

Psalms 3:5-6.

In peace will I both lay me down and sleep;
For thou, Jehovah, alone maketh me dwell in safety.

Psalms 4:8.

because he careth for you

More than anyone else! See Hebrews 13:5-6.