"Unless the Lord builds the house, the builders labor in vain. Unless the Lord watches over the city, the guards stand watch in vain." (Psalm 127:1)
As human beings, we love to do things which are significant and long-lasting. With few exceptions, we want to leave a legacy that will endure forever. That being said, we need to have a strong foundation. Otherwise, everything that we've made will fall down like a Jenga building. What is our foundation? Christ. It is that simple. Everything that we do should be for His glory AND in His will. He needs to be behind our goals, our vision, and our dreams. Otherwise, the "house" of our goals will eventually get smashed and the city where our visions and dreams dwell will be ransacked by Vikings.
Take a look at the cities of ancient civilizations. Notice how most of them are in ruins. They were built in honor of their people, rulers and heroes. However, the Lord decided to cast them down, and their military might wasn't enough to defend them from invaders or natural disasters. Why? The majority of the time, they didn't glorify God. They only glorified themselves. Either they had no interest in Jesus to begin with, or they kicked him to the curb once they became wealthy and powerful. Most people live in a similar way. They ignore God to pursue money, high-tech gadgets, gorgeous lovers, and power. Or once they get their big house with the swimming pool and three cars, they become arrogant and ditch God after serving Him for years, too busy to even have quiet time with Him, much less go to church or preach the gospel. In either case, they will find out the hard way that unless they lived their life for God and stayed in His will, nothing that they did will have any value or purpose, and their lives will become just as desolate as the ruins of a fallen civilization. Put Christ first so that you do not commit the same folly.
