Reading 2 at Mass from 1 John 3 mentions knowing Jesus. The Gospel read from John 10 is all about Jesus being the good shepherd. Verse 14-15: "I am the good shepherd, and I know my sheep and they know me, just as the Father knows me and I know the Father; and I will lay down my life for the sheep." Jesus' love for us is declared here. To know Jesus is to know God and the whole truth!