Trent on Justification - Canon Three

In Canon 3 on Justification the Council of Trent deny that we can do anything on our own by which to move God to give us the grace of justification.

If any one saith, that without the prevenient inspiration of the Holy Ghost, and without his help, man can believe, hope, love, or be penitent as he ought, so as that the grace of Justification may be bestowed upon him; let him be anathema.

This follows from Chapter V of the Decree on Justification, which we discussed here. We cannot save ourselves, but neither does God save us against our will. We cannot merit the grace of justification, but rather God justifies us by his grace.