These are the conditions for committing a mortal sin according to my catechism:
- It must be a grave matter.
- The person who commits sin must have a clear knowledge of the guilt of the action.
- There must be a full consent of the will.
- The person insists in pursuing the sin.
The three aspects needed for mortal sin in the Catechism of the Catholic Church (different than the one you note) are:
Grave matter, Full knowledge and deliberate consent.
scborromeo.org/ccc/p3s1c1a8.htm#III
(insisting on pursuing the sin is not per se part of that…though of course such is sinful).
A nice summary from the Compendium issued by Pope Benedict XVI
- When does one commit a mortal sin?
1855-1861
1874
One commits a mortal sin when there are simultaneously present: grave matter, full knowledge, and deliberate consent. This sin destroys charity in us, deprives us of sanctifying grace, and, if unrepented, leads us to the eternal death of hell. It can be forgiven in the ordinary way by means of the sacraments of Baptism and of Penance or Reconciliation.
- When does one commit a venial sin?
1862-1864
1875
One commits a venial sin, which is essentially different from a mortal sin, when the matter involved is less serious or, even if it is grave, when full knowledge or complete consent are absent. Venial sin does not break the covenant with God but it weakens charity and manifests a disordered affection for created goods. It impedes the progress of a soul in the exercise of the virtues and in the practice of moral good. It merits temporal punishment which purifies.
vatican.va/archive/compendium_ccc/documents/archive_2005_compendium-ccc_en.html