The "blindness" of relativism - Love of God is certain and undeniable

Today's Gospel Reading (Luke 6:39-42)

He also told them a parable, 'Can one blind person guide another? 
Surely both will fall into a pit? Disciple is not superior to teacher; 
but fully trained disciple will be like teacher. 
Why do you observe the splinter in your brother's eye and 
never notice the great log in your own? 
How can you say to your brother, "Brother, let me take out that 
splinter in your eye," when you cannot see the great log in 
your own? Hypocrite! Take the log out of your own eye first,
and then you will see clearly enough to take out the splinter in 
your brother's eyes

The "blindness" of relativism

Today, it turns out to be very much in progress the description
made by St. Paul about "nonage" in the faith: to be tossed back
and forth by the waves and being blown here and there by every
wind of teaching. How many "winds" of doctrine have we known
these recent decades! From Marxism to Liberalism, even to
Libertinism; from collectivism to radical individualism; from
atheism to a vague religious mysticism... and so forth. This is the
worst blindness, because one does not know to which place one is
going or where should one go.

Having a clear Faith, based on the Creed of the Church, is often
labeled today as a fundamentalism. Whereas, relativism —the
"blindness" of thinking according to "what is in fashion"— looks
like the only attitude acceptable to today’s standards. We are
moving towards a dictatorship of relativism which does not
recognize anything as certain and which has as its highest goal one’s
own ego and one’s own desires.

—Our friendship with you, O Jesus, is our "measure": the measure
of true humanism. Your friendship gives us the criterion to discern
between veracity and falsehood, between deception and truth...