Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God. But exhort one another every day, as long as it is called “today,” that none of you may be hardened by the deceitfulness of sin Hebrews 3: 12-13
…callousness happens (in our hearts) when we continue to indulge in anxiety, which always springs from the belief that God isn’t able to care for us properly or that what he provides isn’t enough for us. Such a belief is really unbelief.
What are we to do if we detect hardness in our hearts? We…rightly identify our anxiety as sin.” We acknowledge our anxiety and consciously name it what it is, ‘unbelief.’ “Unbelief underscores every fear and every act of sin we commit. Unbelief is the assertion in our hearts, even if it doesn’t appear to be so, that God cannot be trusted.
Unbelief is the source of all our fears, because unbelief, taking up residence in our minds and hearts, cast aspersions on the good character of God. When we doubt God’s kind intentions, we will certainly go astray in our hearts and eventually become hardened to the comfort he would bring us. We can turn away from the lie of unbelief right now and put our faith in our good Father.
Whether I want to admit it or not. The source of my conflict, despair, and heart pain is my unbelief in the goodness of God–not believing His trustworthiness. He is trustworthy and His promises to us are true. I must cling to that truth, then, I will be at rest no matter what comes.