"Providence is not repugnant to the freedom of the will."

"Providentia voluntatis libertati non repugnat."

     St. Thomas Aquinas, In I Sent., d.39, q.2, a.2.  In IV Sent., d.38, q.2, a.2, ad 1.  De malo, q.6, ad 3.  De malo, q.16, a.7, ad 15.  S. th. I, q.23, a.8, c.  According to Christoph J. Amor, "'Asking makes a difference . . .':  Das Bittgebet bei Thomas Aquinas in der neueren Diskussion," Neue Zeitschrift für Systematische Theologie 50 (2008): 39 (37-61), on file.  Cf. the snippets shared in nn. 97-101 on p. 58:

"Deus operatur in ipso, ut sit ei naturale." 

"Deus in omnibus operatur secundum modum eorum." 

"ad providentiam divinam non pertinet naturam rerum corrumpere, sed servare." 

"providentiae non est naturam corrumpere, sed salvare." 

"Deus operatur in omnibus rebus sicut causa prima operatur in causa secunda."