Molina's own words (disputation 12)
Thesis LXXXIII. This is Molina's express teaching in question 14, article 13, disputation 12: 'It can happen,' he says, 'that of two people inwardly called by God with equal aid, one is converted through the freedom of his choice and the other remains in unbelief. It often happens, too, that one person is converted with the same aid with which another is not.
'Indeed it can happen that someone anticipated and called with far greater aid is, in his freedom, not converted, while another is converted with far less. For God often calls, and sinners refuse and scorn all God's counsel.'
Latin
LXXXIII. Haec est expressa Molinae doctrina quaestionis 14. articulo 13. disputatione 12. Fieri potest, inquit, ut duorum, qui aequali auxilio interius a Deo vocantur, unus pro libertate sui arbitrii convertatur, & alter in infidelitate permaneat: saepe etiam accidit, ut cum quo auxilio unus non convertitur, alius convertatur. Imo fieri potest, ut aliquis praeventus & vocatus longe majori auxilio, pro sua libertate non convertatur, & alius cum longe minori convertatur. Saepe enim Deus vocat, & peccatores renuunt, despiciuntque omne consilium Dei.