(Pro 28:26 KJV) He that trusteth in his own heart is a fool: but whoso walketh wisely, he shall be delivered.
We have a saying, “Let your conscience be your guide”. That is better than no guide but we need to understand that it is not infallible. Your conscience is a product of input. Picture a new born. Infants are not known for their sense of right and wrong. They only know, “I want.” Move forward to the middle school level that I used to teach at. It always impressed me how many of the kids had a basic sense of right and wrong that was not too bad. The problem was to get them to admit it in the face of public pressure. Somewhere in that time the pressure of socialistic thinking being forced in them in school begins to wear them down and by college most of them have not reliable inner guidance system any more.
So we cannot trust our “heart” (3820). We can only trust the unchanging truth that God lays out for us. When our hearts are regenerated and taught the truth they can become a useful guide but we always need to make sure they are consistent with the objective truth of God.
So? If you have not already done so, get your heart right with God. Then you can begin to trust your motivation.