To cast your burden is a decision of the will. God who made us know that our shoulders are not broad enough to carry anything let alone burdens, anxieties, cares of this world.
The word, 'cast' suggests an act of throwing something away without the thought of ever going back to retrieve it. It is therefore a once-and-for-all proposition. Whatever it is that is causing you to be anxious, commit it to the LORD now. Let's look at another scriptures: "Casting the whole of your care - all your anxieties, all your worries, all your concerns, once and for all on Him for He (Father God) cares for you affectionately, and cares about you watchfully."
Another translation renders the verse thus: "Cast every worry you have upon Him......"; another translation puts it thus: "Throw back on Him the burden of all your anxiety...you are His personal concern" Let these life changing words soak into your spirit and purpose to act on it.
CONFESSION - I lay all my burdens down at Jesus' feet now and will no longer carry any burden, fret or worry for Father God affectionately cares for me.
Psa 37:5; Psa 55:22; Psa 139:2; Isa 26:3; Matt 6:25; Phil 4:6-7; 1 Pet 5:7