We ought to always be discerning
1 Corinthians 2:14 But the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned.
John 14:26 "But the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all things that I said to you."
Our superficial world teaches us to be a human doing instead of a human being. We are taught how to speak, what to wear, how to drive, wear to get food, how to eat, and how to sleep. When someone acts differently then the way we know and understand we instantly believe something is wrong with that person. If someone wears a swim suit to a formal occasion they must be disturbed. If someone is unemployed they must be going through hard times. If someone doesn't drink alcohol they must have a problem. If someone doesn't go to church, what would that mean? If a person did not sing during service would they be sinning? If an individual skipped the worship and just attended for the sermon would they be missing something? And what if a drug addict came to your church off the street to be saved because they finally realized they needed God, would you send them to a 12 step meeting, and if you did would that be right or wrong?
1 Corinthians 2:12 Now we have received, not the spirit of the world, but the Spirit who is from God, that we might know the things that have been freely given to us by God.
To gain understanding from the spirit we must pay more attention to everything from a spirits point of view. How would the Holy Spirit of God within us see our spouse, coworkers, employers, school mates, teachers, or pastors? What about material things like money, clothes, car, house, status, position, etc? What would Jesus do? We are called to think more like this throughout every day to better understand God and each other's souls.
The terms 'all' and 'every' are terms which lead one to believe perfection. Since God knows we sin he understands we will not and cannot obtain such perfection. Why is all and every used in the bible? Read (http://biblehub.com/greek/3956.htm).
This becomes complicated quickly. We ought to take time and learn each day to better understand the bible.
Examine the source
The bible was written in a different language, different culture, and a different time. We translate and interpret meaning based on our own ideas, customs, and Christian subculture. King James version seems to be the most accurate. Different translations are different.
We tend to do what we see others do and believe what others believe thinking that they must be right. The bible warns us over and over not to do this. We are to seek God, not what someone else tells us about God. There are many "blind Guides." Instead of book studies have bible studies. Skip the middle man. If the bible is the truth and the inspired word of God, why read something else?
Improve objectivity watch for personal bias
Watch for preferences, expectations, wants, favoritism, and personal leanings. Our own belief system often times will defend itself against opposing arguments on reflex without being consciously aware of it. As we discover this spiritual handicap we may learn to identify it more and more as it influences us toward bias activity.
Look for patterns
When something is repeated over and over it deserves more attention. When a teacher in a classroom instructs on something multiple times it would be wise to know and understand it. When different books of the bible repeat certain points it would be wise to know and understand them.
Experience correctly points of interest for correct understanding
The bible speaks about love, but love cannot be understood only by reading about it. It takes participation in active engagement with it, within us, with God, and with others to understand it. Love is a spiritual sensation of God flowing through us.
Many people misinterpret love as some euphoric feeling acquired by obtaining a happy ending fantasy (first love experience). Once crushed by their misplaced dependency upon another person, their God/idol, their everything, they avoid ever giving themselves to another. Once bitten, twice shy. They guard their feelings, withdraw emotionally and spiritually, and live life in a shell. This often leads to emptiness and loneliness. This is not God's intention. God is to be our everything, master, and savior. The knight in shining armor is not our protector. The princess is not our angel. We are all sinners and fail. Such stories, movies, and ideas are ego feeding and God reducing propaganda. They lead us into believing if we only had... then we would be happy. We grow up with it and it is alive in many of us. All we need is God.
Incorrect Interpretation of messages can ruin faith
There are many people who take in parts of a message while excluding themselves from other parts. Selective interpretation occurs based on a person's current beliefs. We seek information to support what we believe. There are many people who believe God is angry with them and sending them to hell. They believe they can't be saved. A pastor may preach an hour on God's love, forgiveness, salvation, and list countless quotes out the bible, but when a person believes so strongly they are going to hell or are unforgivable this preaching will not suffice. Such an individual must recognize their personal bias and prejudice toward their one sided viewing before any help or willingness to see can happen. To learn truth we are to seek God honestly, sincerely, with and open mind and heart.
Romans 2:5 But in accordance with your hardness and your impenitent heart you are treasuring up for yourself wrath in the day of wrath and revelation of the righteous judgment of God,