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Collect: O God who works within us both to will and to work, move our wills by grace to accept thy grace, through Christ our Lord. Amen.
In the Sed Contra, St. Thomas draws a consequence from John 6:45 which teaches that hearing and learning is involved in justification. This implicitly involves a movement of the free will.
In the Respondeo, St. Thomas argues from the ordinary working of Divine providence. For, God does not destory the nature of things in working among them, rather, he acts in accordance with that same nature. Thus, he does not violate and compel our liberty, but actualizes it by his grace, working in and through it.