Definition: He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.

Explanation: Okay, let’s break down this verse from 1 John 2:4. It's a really important one about trust and obedience. Here’s what it means in simpler terms: Think of it like this: “He that saith…” – This refers to someone who claims they know God, but doesn’t actually follow His rules. They might say things like “I’m a good person” or “God loves me.” “…and keepeth not his commandments…” – This means they're breaking the rules that God has given us. It's like when you promise to do something and then don't actually follow through. It could be anything - obeying laws, being honest, treating others with kindness, etc. “…is a liar…” – This is the core of the verse. Someone who doesn’t keep their promises or follow God’s teachings isn't telling the truth. They're deliberately misleading themselves and others. “and the truth is not in him.” – This means that because they aren’t following God’s will, the real, true answer or reality – the truth – isn’t being revealed to them. It’s like a shadow or a lie. In short, this verse warns against someone who says they know God but doesn't actually live according to His teachings. Why is this important? This verse is about trust and faith. We should always trust that God is guiding us and that He will reward those who follow His principles. If someone isn’t living right, it means they don’t truly believe in the truth of God's word. Do you want me to: Explain a specific aspect of this verse further? (e.g., what does “keepeth” mean?) Give you some examples of how this principle applies to our lives?