The Bible has much to say about the wickedness of the hearts of men (and women). Unfortunately, it's a natural bent to lean toward sin. I wish it weren't but it's the reason we simply cannot save ourselves from ourselves.
It takes work to counter the our natural bent toward the desires of the flesh. There is a battle raging in the spiritual realm we need to recognize. We need to be striving for more of Jesus and striving toward righteousness.
Desires of the Flesh
It's so easy to get caught up in our own wants and fleshly desires. So easy. Doing anything against what we want to do will almost always be a battle.
But the Bible still tells us to put on the Lord Jesus Christ so we will not fulfill the lusts of the flesh (Romans 13:14). When we are walking in the Spirit, we will not give into the desires of the flesh (Galatians 5:16). This is why we must let Him lead us. When we feel our conscience prick, that is the Spirit! That is conviction.
Are we walking with the Spirit when we give in to our own desires? What do these desires entail? Is it shopping for yet another thing we don't need? Is it indulging in a TV show we claim is our "guilty pleasure"? Is it being lazy? Is it giving into anger?
There's a Battle Waging War
In places we cannot see with our physical eyes is a war for deeper intimacy with Jesus. The enemy nor can man pluck us from the hand of God. But we can make the conscience decision to turn away from Him based on what we consistently feed our mind and spirit.
The fleshly desires are contrary to the Spirit. They are literally in conflict with one another because the Spirit fights for our good, so we don't just do whatever we want or whatever we feel is right (Galatians 5:17).
We must learn the Spirit's voice by reading God's Word. The more we read the Bible, the more we learn who God is.
The Bible tells us we need to practice righteousness.If we are not practicing righteousness, we are not of the Lord. (1 John 3:10). It is not something that comes automatically simply because we are walking with the Lord. It is something we must practice doing.
But it's not something we should flaunt doing, so we must be careful. We must be humble in this area. We should not practice righteousness in order to be seen or admired by men. (Matthew 6:1).
Restoration Through Conviction
God convicts us for the purpose of restoring us to Himself. When we consistently engage in the same sinful practices, and get that uneasiness, but ignore it, eventually our hearts will become hardened to His promptings. We separate ourselves by giving into the flesh over the things of the Spirit.
It's very difficult to walk with the Lord when we've shut Him out continuously. There are times we don't even realize we're doing it and it becomes more and more evident as we push and push Him away through disobedience.
How do we know when we're hearing God's voice? Because it will reiterate what is already in the Bible. God's voice will always lead us to what is better--to what is best.
Tend to your heart by filling it with God's word and avoiding what is not good. Abstain from what is evil.