Psalm 118:8 "It is better to trust in the LORD than to put confidence in man."
We should have confidence in God because he has control over everything. (Even the devil has to get permission before he attacks us!) But the reality is God is in control of everything, except us. You see we have choice. We can either choose to have confidence in the Lord, or not. We can choose whether or not to have the Lord be in control of our life. We can choose whether or not we will surrender to His will, or continue to pursue our own will. To give Him control, means to be in His Word and to trust Him! That doesn't mean bad things won't happen, look at Job. It does mean that letting God be in control and trusting in Him to make decisions will ensure we're in His will. And, God's perfect will is definitely where we should be.
There are 19 verses in the Bible that specifically state "Trust in the Lord", my favorite is: Proverbs 3:5 "Trust in the LORD with all thine heart; and lean not unto thine own understanding."