Trust God with the present and the past

In the past three to four days God has been revealing to me another important concept.  This concept came up through reading a book,  confessing a struggle to someone, and thinking about one of my passions.    It is the practice of trusting God with certain things in your life.  The way this is formed is by trusting God with our past so we can trust him with the future.   David put this concept into practice before he fought Goliath.    Before the battle, Saul doubted David could face such a big specimen as Goliath. 
In 1 Samuel 16:34-37, David remembered how God had delivered him in the past when he fought lions and bears while tending his father's sheep. In verses 35, he trusted that God would protect him against Goliath like he protected him against the lion and bear.  While in verse 36, he remembered how God used him to kill the lions and bears, therefore he had ultimate trust he could defeat Goliath.   Also, in verse 37  David knew that God was sovereign and in control of this situation.   Lastly, in verse 37 recognized that God would ultimately get the glory in this battle.
Another area of trusting God can be seen through Proverbs 3:5-6.  In these verses the Solomon, David's son writes, "Trust in the Lord with all of your heart, and lean not on your own understanding.  In all of your ways acknowledge him, and he will make your paths straight." During this section,  Solomon gives us a picture that trusting God starts with depending on God.  Also, it involves remembering that God is working in this process.  When we acknowledge God is working in this process, then we will lead and guide us where he wants us to go. 
This reminds me that I need to constantly trust God with specific struggles in life.  God has revealed to me that since he has delivered me from my driving problems in the past that I can trust him in the future.  Also,  God has delivered me from specific job struggles and he will lead me in the future.  God is constantly growing our ability to trust him.  It grows from a small thimble when we first become believers to a cup as we grow and mature.     So, in essence what can you trust God with today?