God knows the future and all the hurdles we have to face before getting to our destination. He knows what we have to pass through. He knows the steps we must take to get to our particular destination. This is why it is wise to walk with God. When you are walking with God, you are assured of where you are going.
You know for sure that you will get to your destination because God leads you. The Bible confirms this in Jeremiah chapter 29:11, which says,
For I know the thoughts that I think toward you, says the Lord, thoughts of peace and not of evil, to give you a future and a hope.
If you walk with God. The thing is, there is only so much you can achieve by your power. You need God, you need to partner with God and rely on him in order to fulfill your purpose. You cannot get to that destination alone. Zechariah chapter 4:6 says
Then he said to [a]me, “This is the word of the Lord to Zerubbabel, saying, ‘Not by might nor by power, but by My Spirit,’ says the Lord of armies.
You cannot do it by your power or strength alone. You need God. When you walk with God, you have the assurance that you are not walking on the wrong path. When you are on the path of purpose, you will face seasons of doubt where you will be unsure of yourself. You may even become worried or fearful that you will not reach your destination. However, the word of God has made it simple for you and it can calm your fears, because you know that when you walk with God, you cannot fail.