Merriam-Webster defines trust as, "assured reliance on the character, ability, strength, or truth of someone or something."
Trust in the character of God. His ability to see your future. His strength to get you through another hour. His truth that cuts through all the crap you hear on TV or through gossip.
All of your heart - with everything you have - all of your mind, emotions, body.... from your toes to your tongue to the hairs on your head. Trust with all your heart.