With that truth fixed in our minds, there is a small but powerful Scripture tucked away in 1 Peter 5 that has immense implications for our souls. It says in verse seven of that chapter, “Casting all your anxiety upon Him because He cares for you.” These words are soothing to a wounded soul. They point believers to the One whom we can trust because of who He is and what He has done. They demonstrate God’s compassion and love. The word “casting” means to throw something. It’s like fishing: You cast your line in the water. You throw it from you. In this case, notice that we are told to “cast anxiety”, which in context means all of the discontent, discouragement, despair, questioning, wondering, pain, and suffering that we might be going through. We are to give it all to Him and exchange it for trust in the God who truly cares about us. Hannah is a great illustration of this in 1 Samuel 1:10–18. Desperately wanting a baby boy, she cast her anxiety on God. “She, greatly distressed, prayed to the Lord and wept bitterly.” She was a broken-hearted woman under God’s mighty hand of testing. The passage tells us, “She made a vow and said, ‘O Lord of hosts, if You will indeed look on the affliction of your maidservant and remember me and not forget Your maidservant but will give Your maidservant a son, then I will give him to the Lord all the days of his life, and a razor shall never come on his head.’ Now it came about, as she continued praying before the Lord, that Eli was watching her mouth. As for Hannah, she was speaking in her heart, only her lips were moving, but her voice was not heard. So Eli thought she was drunk. Then Eli said to her, ‘How long will you make yourself drunk? Put away your wine from you.’ But Hannah replied, ‘No, my lord. I am a woman oppressed in spirit; I have drunk neither wine nor strong drink, but I have poured out my soul before the LORD. Do not consider your maidservant as a worthless woman, for I have spoken until now out of my great concern and provocation.’ Then Eli answered and said, ‘Go in peace; and may the God of Israel grant your petition that you have asked of Him.’ She said, ‘Let your maidservant find favor in your sight.’ So the woman went her way and ate, and her face was no longer sad.” As we continue to read 1 Samuel 1, we see that God gave her a child. What happened to her before that? It says in verse 18, “she went her way and ate and her face was no longer sad.” Why? How was it no longer sad? Had anything changed? No. But what had she done with the burden? She gave it to the Lord, the One who would carry it for her.
Source : http://magicvalley.com/news/local/pastor-s-corner-cast-all-your-cares/article_033cc14c-ad87-5e8f-b83f-c2319d13fa0c.html