"Let the Holy Spirit guide your lives. Then you won’t be doing what your sinful nature craves. The sinful nature wants to do evil, which is just the opposite of what the Spirit wants. And the Spirit gives us desires that are the opposite of what the sinful nature desires. These two forces are constantly fighting each other, so you are not free to carry out your good intentions." ~ Galatians 5:15-16 (NLT)
Like all humans created in the image and likeness of God, you are made up of 3 distinct parts: You are a spirit (pneuma), have a soul (psuché), and live in a body (soma). Your body is your house. Your soul is your mind and emotions. Your spirit or your heart, well, that's the real you! It's the part of you from which you function at your highest and best.
Your enemy, the Devil, wants to relegate your life to emotions and appetites because he's terrified of you "living in the spirit." He would like nothing more than for your life to be governed by emotional highs and lows (the current of this age) or by what feels good. However, living in the lower level of the flesh and feelings is not God's best for you!
The highest version of you is you-in-faith. Faith is what pleases God. Faith is your God-given capacity to know Him, hear His voice and follow His lead. So, strengthen your spirit by spending time worshipping God. Build your faith by reading His Word and praying. Then, go live your fruitful and fulfilling life, not caught and governed by the flesh and the currents of this world; but rather led by the very Spirit of God as you "walk by faith and not by sight."