Emotions are neither...they follow your mind(heart). Change your thinking and emotions will follow thoughts
thoughts make up the heart(affections) affections usually guide us and direct our desires.
Proverbs:
Above all else, guard your heart, for everything you do flows from it. (NIV)
Keep and guard your heart with all vigilance and above all that you guard, for out of it flow the springs of life. (AMP)
Keep thy heart with all diligence; for out of it are the issues of life. (KJV)
Romans 12
1 I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service. 2 And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
1 Peter 1:13-16
King James Version (KJV)
13Wherefore gird up the loins of your mind, be sober, and hope to the end for the grace that is to be brought unto you at the revelation of Jesus Christ;
14As obedient children, not fashioning yourselves according to the former lusts in your ignorance:
15But as he which hath called you is holy, so be ye holy in all manner of conversation;
16Because it is written, Be ye holy; for I am holy.
So following your heart will help or hurt depending on what you set your affections on...what your mind is fixed on
whether things above and in faith. Or things below and carnal. Emotions will just follow.