"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 straight your paths." This saying from the book of Proverbs is a well-known and oft-quoted Bible memory verse. Most teaching and preaching focuses on verse 5 about trusting the Lord rather than one's self. What is most interesting to me about these verses is the straight paths metaphor presented in verse 6. The ancient Hebrews were a nomadic people and it was important to travel the same paths to pastures and campsites. If these straight paths were not followed, one could get lost in the desert or wilderness. So if in all your ways you acknowledge the Lord--that is, you surrender your will to God's will in every realm of life because He is all-knowing and all-loving--then He will make the path of your life lead straight to its intended destination and you will not get lost and wander around looking for the right way. This does not mean that God's promise to make your path straight does not mean there will be no problems.
God's promise is to guide you and sustain you through all difficulties along the straight path of life, not to remove difficulties from your path.
