Often in the scriptures, heart is used in lieu of spirit and the reason is clear. Just as the physical heart is the operational centre of the human body, so also the spirit is the controlling centre of human existence. Everything about your life actually originates from your spirit. Success or failure, wealth or poverty, excellence or mediocrity will emanate from a man’s spirit.
Your mind is the door to your spirit. That’s why whatever words and thoughts you allow to go through your mind, unchecked, will be deposited in your spirit. This is the reason you have to sift what goes through your mind to your spirit. Every day, we hear words, see things, and receive all kinds of information, positive and negative alike. You’re required to mount guard on your heart and not allow your spirit receive and process the wrong information.
If, for example, you heard that there’s trouble in the economy or that recession is setting in, and there’s hardship everywhere, don’t be perturbed, because you’re not of this world. Refuse to process such negative information; don’t dwell on it. Rather, you should say, "I refuse to fret or be anxious, because I function in the realm of superabundance. I’m an heir of God and a joint heir with Christ. I function above the economies and economics of this world."
If you give wrong thoughts access into your heart, they’ll instil fear in you. So, keep vigilant watch over your heart. Embrace only thoughts of success, victory, health, prosperity, happiness and fulfilment that come from God’s Word.