Trust in the LORD with all your heart and do not lean on your own understanding. In all your ways acknowledge Him, and He will make your paths straight. Proverbs 3:5,6
Trust is defined in Websters New World Dictionary as firm belief or confidence in the honesty, integrity, reliability, justice, etc. of another person or thing; faith, reliance.
Trust is built through relationship. My first swimming instructor at a summer camp I attended as a youth told me, Dive in, Ill make sure you come up! As I dove in, he moved back, and after what seemed like an eternity, I sputtered to the surface by myself to hear him say laughingly, See, I knew youd come up! Immediately I lost my trust in him, and needless to say I didnt learn to swim that summer.
Jesus is not like that! He is completely trustworthy! Eighteen years ago the Lord called our family to move to Vermont; a radical move, considering I had been established in the same job for twenty years. A teacher friend of mine suggested that it might be good to take a years leave of absence, just in case it didnt work out. Fortunately I didnt take that advice, and I have never had to look back and second guess what the Lord said to me.
Thats what this scripture in Proverbs is talking about. When we trust in the Lord with all our heart, things dont have to fit together neatly in our own understanding. The Lord often asks us to trust Him without our fully understanding every detail; to have faith in Him. To the unbelieving person that is foolishness, but scripture promises us that if we will trust Him completely, and acknowledge that He is Lord of each and every detail, He will direct our paths and make them straight, and lead us in righteousness. Only He knows the end from the beginning; only He knows the plans He has for us, plans for welfare and not for calamity to give you a future and a hope (Jer. 29:11).
Know therefore that the LORD your God, He is God, the faithful God, who keeps His covenant and His lovingkindness to a thousandth generation with those who love Him and keep His commandments (Deut. 7:9) It is as we trust Him and in faith do the things He asks that we experience the truth that He is faithful and completely trustworthy.