When we rely on our human understanding, it limits us because we cannot tell those things that are good for us until we look into the Word of God. The Word of God is the wisdom of God, and wisdom is the principal thing. There are many things that seem like the truth but are actually a perversion of truth. As believers, we have the Spirit of wisdom, for Christ has been made Wisdom unto us ( 1 Corinthians 1:30). So we can discern the truth and walk in it.
It’s not everything that comes your way that’s a blessing from God; it’s not every job that is of God; every lady that likes you can’t be your wife and it’s not all the money that comes your way that’s a financial blessing from God. You can only know those things that are good for you through the Word of God and by His Spirit, for the Spirit and the Word are one. If God’s Word says “Do this...” then you should because it’ll be for your good.
Don’t try it out first to see if it’s good for you or not. Some people say experience is the best teacher but that’s not true. You don’t have to suffer the consequences of your actions before learning something. If you’re not sure about it, look in the Word, or else, leave it alone. Colossians 3:16 says, “Let the Word of Christ dwell in you richly…” so that when you face situations that require immediate response, there’ll be sufficient information in you to decide in agreement with the Word. This is the reason you must invest your time and resources in God’s Word; in it is all the life-giving information you’ll ever need.