"Casting all your care upon Him; for He careth for you." (1 Peter 5:7)
When I think of 'casting,' immediately I think of fishing. Throw out the line (hook and bait of course) then reeling it back. Casting our care upon the Lord, to some, maybe just like that. They would pray and confess and get things right with God, and ask God to comfort them and aid them in their trials BUT then sooner or later, they reel back their problems and they may do this over and over again. Thankfully - God did not have 'fishing' in mind when He instructed us in this passage. The word 'cast' carries the idea of throwing something out with force (to fling) without the capacity of taking it back. Much like when you throw a pebble as far as you can out to a body of water, the chances of getting that back is realistically nill. God wants us to approach Him in hard times and bring before Him our prayers and supplications. Another good verse to keep in mind along this line is Philippians 4:6 "Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God."