John 14:21
"Those who really love me are the ones who not only know my commands but also obey them. my Father will love such people, and I will love them. I will make myself know to them."  

Obey. Love. See.
Those are the basics of what John 14:21 says. God repeats all this through the Bible.
What it means is, if you obey Jesus you will show that you love him! Therefore he will show himself to you!