2 Timothy 3:16, 17 (NKJV)
Years ago I worked at a company that built wooden beams and arches that were used in the construction of different kinds of buildings. We made beams and arches of various sizes but every project started the same, we had to look at the blueprint. Our foreman received the blueprint from the company office that listed the specific details for that beam or arch. To correctly complete the job we had to pay attention to the blueprint and build that beam or arch accordingly. We could not just decide among ourselves what we wanted it to look like; we had to follow the blueprint to be successful.
In the Old Testament Israel built the Tabernacle in the wilderness and later a Temple. In each situation God gave them a specific pattern to follow. The people involved could not just decide how they wanted these things to look. God gave them each building's dimensions and told them what materials to use. If Israel had deviated from the plans that God gave them they would have built something but it would not have been what God wanted them to build. The same thing is true today, God has a blueprint for us to use for our life, His Word, and to build a successful life we have to follow God's plan.
In 2 Timothy 3:16, 17 we see that God's Word is what we need to be complete and equipped for every good work. The Bible shows us how to build correct doctrine, how to live a righteous life, and it gives us guidelines to correct us and keep us on the right course. God is a lot smarter than we are and He knows best how we should build our life. Too many times people have gone through life and built something, but it was not what God wanted. It is not up to us to decide how we will build our life, we need to go to God's Word for our own blueprint; to be successful we must follow God's plan.