In Christ there nothing I can do to make you love me more
and there is nothing I have done that makes you love me less
Your presence and approval
is all I need for everlasting joy
As you have been to me so will I be to others
I will measure your compassion by the cross
And your power by the resurrection
In essence what he is saying is the pressure is off. You can't do anything to make God love you more in Christ because God's love for Christ is perfect. So instead of trying do things you think will please God focus on the primary command. Love the Lord your God with all your mind, heart, and soul and thy neighbor as thyself. That is to say live your life as a grateful response to the love that God demonstrated on the cross. The same power that raised Christ from the dead is the same power that will allow you to live a life of gratitude to the God who love you enough to take your place.
You see Christ did for us what we couldn't do for ourselves. Therefore is we focus and saturate our lives with the gospel (life, death, burial, and resurrection) of Jesus Christ we see his love in action. Gospel is not something you believe to get saved but the Gospel is what keeps you saved daily (sanctification).
So the pressure is off just focus on loving God first and once you see how God has loved you then you love others in the same capacity. So simple a child could understand.
Scripture Reference: John 19:30