What topic could I use for a sermon to people who don’t believe, based on the passage I mentioned?

Start with Isaiah 1:18. Read it slowly, reflecting on God’s invitation: Isaiah 1:18: “Come now, and let us reason together, saith the LORD: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool.” To understand the context better, read Isaiah 1:1; Isaiah 1:2; Isaiah 1:3; Isaiah 1:4; Isaiah 1:5; Isaiah 1:6; Isaiah 1:7; Isaiah 1:8; Isaiah 1:9; Isaiah 1:10; Isaiah 1:11; Isaiah 1:12; Isaiah 1:13; Isaiah 1:14; Isaiah 1:15; Isaiah 1:16; Isaiah 1:17; Isaiah 1:18; Isaiah 1:19; Isaiah 1:20 afterward. The verse isn’t a shallow promise that nothing matters. Instead, God confronts sin, injustice, and empty religious practice, while still offering a way back. The central idea is the invitation to draw near. God doesn’t ask people to hide their guilt, but to bring it into the light and let Him transform them. Pause for a moment and consider: is there some guilt, hurt, or part of your story you’ve been trying to keep from God? Talk to Him about it honestly. The passage begins with confrontation, but points toward cleansing and hope.

Maybe it isn’t just laziness. Sometimes it may be tiredness, accumulated worries, guilt, or the feeling that we have to read a lot to please God. But the Bible isn’t a test to pass; it’s a place to meet with the Lord. The passage you mentioned begins with an invitation: God calls you to speak with him. You don’t have to pretend everything is fine. He invites you to come as you are, with distractions, discouragement, worries, and even a lack of motivation. The promise is that he can restore, making clean what was marked by sin. Start small. Instead of setting a demanding goal, read for five or ten minutes, or choose just a few verses. Take your time and ask: “What does this text show me about God? What does it reveal about my heart? Is there something I should hand over or put into practice today?” Reading a little with attention can nourish you more than going through many chapters just out of obligation. It may also help to choose a simple, realistic time. Leave the Bible somewhere visible, set your phone aside for a few minutes, and begin with an honest prayer: “Lord, I don’t feel like reading, and my mind is full. Help me stay close to you. Show me what I need to hear, and receive my worries.” After reading, write down three things weighing on you. For each one, pray: “Lord, I leave this in your hands.” Handing over your worries doesn’t mean they’ll disappear right away. It means you don’t have to carry them alone, and you can return to God whenever they come up again. If you miss a day, don’t condemn yourself. Just pick it up again the next day. Guilt often says you’ve already failed too much; grace invites you to return. Don’t wait until you feel strongly motivated to begin: often, that desire returns after a few minutes of quiet faithfulness. This week, try this rhythm: five minutes of reading, two minutes of silence, and a prayer handing one specific worry over to the Lord. Do it without demanding perfection from yourself. God works in silence too, and his presence doesn’t depend on you having an intense spiritual experience.

I'm sorry someone is hurting you and affecting your spiritual life. Forgiving doesn't mean denying the harm, excusing it, or letting it continue. In Isaiah 1:22: “Thy silver is become dross, thy wine mixed with water:”, God condemns the corruption of his people. The image speaks of something valuable that has been contaminated or diluted. It isn't a direct instruction about how to forgive, but it may help you recognize that harm to your spiritual life matters and that you don't have to pretend everything is okay. From a Christian perspective, forgiveness can begin as a decision not to nurture revenge and to put the matter before God. Sometimes feelings take longer to catch up. You can also create distance, clearly say what behavior you won't accept, and seek support from someone you trust. Forgiving doesn't require you to reconcile or restore trust; those things require safety, responsibility, and real change. If there is abuse or a threat, prioritize your safety and seek help. You could begin with a simple prayer: “God, help me let go of revenge and care for what is being wounded in me; show me what boundary I need to set.”