In ST 1.75.2, which asks «whether the human soul is something subsistent,» the first objection argues that any subsistent thing is a «certain something» [hoc aliquid] and that, since a certain something is a composite of soul and body, the soul can not be a certain something. (faith.org.uk)
The first objection to actually singing the Mass is that it is impossible. (faith.org.uk)
Since it is altogether likely that some innocent persons have been executed, this first objection is a serious one. (firstthings.com)