What is the origin of velleity?

Just the mere sound of velleity makes one loath to leave one’s hammock. A velleity is a mere wish, unaccompanied by an effort to obtain it, too weak even to be a desire, a perfect word for a July afternoon. Velleity comes from Medieval Latin velleitās (inflectional stem velleitāt-), a noun made up of the Latin verb velle “to be willing, want to” (from the same Proto-Indo-European source as English will) and the abstract noun suffix –itās, which via Old French –ité becomes the naturalized English suffix –ity. The odd thing about velleity is that its earlier occurrences, from the first half of the 17th century through the mid-18th, are in theological controversies, gradually yielding to philosophical arguments during the early 18th. Velleity entered English in the first half of the 17th century.