Test what you hear
The Bible does not ask people to switch off their minds. When Paul preached in Berea, the listeners checked his message against the Scriptures instead of accepting it merely because he was an impressive speaker. Their careful searching was praised, not criticised (Acts 17:11).
That pattern still helps. A sermon, online post, popular opinion, or even a deeply felt personal impression should be weighed against what God has revealed. Paul tells Christians to test things carefully and hold on to what is good (1 Thessalonians 5:21). Critical thinking, in this sense, is faithful attention.
These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
Listen before you answer
Good judgement begins with patience. Proverbs warns against answering a matter before hearing it fully, because doing so brings foolishness and shame (Proverbs 18:13). It is easy to react to a headline, repeat a rumour, or assume we know someone else's motives. Scripture invites a slower, more honest way.
James gives similar practical counsel: be quick to hear, slow to speak, and slow to anger (James 1:19). Asking fair questions, checking context, and admitting "I don't know yet" can be acts of humility. They make room for truth rather than simply defending our first reaction.
Seek wisdom, not just information
Knowing many facts is not the same as being wise. Biblical wisdom helps a person see life from God's perspective and choose what is right. James tells those who lack wisdom to ask God, who gives generously (James 1:5). Prayer belongs in serious thinking because some questions involve motives, suffering, relationships, and choices that facts alone cannot settle.
The Bible also calls believers to a renewed mind rather than being shaped unthinkingly by the world around them (Romans 12:2). This renewal is gradual. As you read Scripture in context, pray, and learn with mature Christians, your instincts can become more aligned with God's good purposes.
And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
Discernment is not cynicism
There is a difference between discernment and suspicion. Discernment asks, "Is this true, and does it lead me towards Christ?" Cynicism assumes everyone is deceptive and nothing can be trusted. John urges Christians to test spiritual claims because not every voice speaks for God (1 John 4:1), but that instruction is meant to protect faith, not make people harsh.
So bring your questions to Scripture openly. Read the surrounding passages, notice who is speaking and why, and compare one teaching with the wider message of the Bible. A thoughtful Christian can be both humble and clear-minded, eager to learn while holding firmly to what is true.
Prove all things; hold fast that which is good.