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cf., ST.I.Q86.A4; Sent.I.D38.Q1.A5; SCG1.C67; QDeVer.Q2.A12; QDeMalo.Q16.A7; QXI.Q3.A; DeRatio.C10; CT.BookI.C133; Peri.Bk1.L14
This article is quite a controversial one. In order to clarify the meaning of St. Thomas, we just need to note what is meant by "future" and "contingent."
"Future" is said in reference to us, not in reference to God.
By "contingent" is meant "those things whose PROXIMATE causes are not determined naturally to an object." Thus, the will of man is something that is contingent per the particular goods we may choose (although, in another sense, it is not contingent in seeking happiness, which will be covered in another place).