Dear friends, if our hearts do not condemn us, we have confidence before God and receive from him anything we ask, because we obey his commands and do what pleases him. And this is his command: to believe in the name of his Son, Jesus Christ, and to love one another as he commanded us. Those who obey his commands live in him, and he in them. And this is how we know that he lives in us: We know it by the Spirit he gave us. 1 John 3:21-24 (NIV)
What if you lived by these verses and no others? You could then go about your life, enjoying it and resting in the assurance that you were in right relation to your God and to your fellow man. Notice this text says nothing about confessing your sins, of being forgiven or being purified as 1 John 1:9 does.
If you must have more then, how about 1 John in its entirety?