I think both St Mark and St Matthew gave us the main and central Jesus quote, not St Josemaria.

It's the "working with" that quote (and in the squeezing of what we can from that quote into our ordinary every day life, which becomes our "response" to Jesus) which is in question.

As the Church says...faith is our response to God.

So it is quite reasonable for us to ask the questions I gave above, or equivalently demanding and probing questions.

We can dismiss or reject the universal call to holiness each Christian has received; we can try to make it smaller or less demanding (and less today, now) on us; but then we're left to examine (hopefully in prayer & not during our judgement) how was our response to Him?

Was it full, complete, cheerful and trusting?

Did we love Him w/ all our heart, mind, soul, & strength?  

Or did we "define down" the message from Jesus?

Did we, through our own pride, ego, vanity cause others to "define down" Christianity?

Good questions to work over.