1 John 2:3 And hereby we do know that we know him, if we keep his commandments.
4 He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
5 But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.
These three scriptures begins showing us how we can know God. Starting here and through the rest of the chapter we will see thirteen ways to know God. These verses tell us it is by keeping His commandments. They tell us that we will know God if we keep His commandments and that by keeping His word the love of God is perfected in us which is evidence that we are in Him. It also tells us if we say we know Him and do not keep His commandments then we are a liar and the truth is not in us. We hear a lot of people say the Old Testament is not important anymore because Jesus took all that away. But Jesus said He came to fulfill the law and even added to the commandments. If we could obey the ten commandments today we would live in a better world and we would love our neighbor as Jesus said we should.