Read about it here.
Act of Reparation to the Most Blessed Sacrament
With that most profound respect
which divine Faith inspires,
O my God and Saviour Jesus Christ,
true God and true man,
I adore Thee,
and with my whole heart I love Thee,
hidden in the most august Sacrament of the Altar,
in reparation of all the irreverences,
profanations, and sacrileges, that I,
to my shame, may have until now committed,
as also for all those
that have been committed against Thee,
or that may be ever committed for the time to come.
I offer to Thee,
therefore, O my God,
my humble adoration, not indeed,
such as Thou art worthy of,
nor such as I owe Thee,
but such, at least,
as I am capable of offerings;
and I wish that I could love Thee
with the most perfect love
of which rational creatures are capable.
In the meantime,
I desire to adore Thee now and always,
not only for those Catholics
who do not adore or love Thee,
but also so supply the defect,
and for the conversion of all heretics,
Jews, and idolaters.
Ah! yes, my Jesus,
mayest Thou be known,
adored, and loved by all
and may thanks be continually given to Thee
in the most holy and august Sacrament!
Our Lady of Reparations, pray for us!