depone (put down)
serpentem ([the] snake)
et ab venono(and from the poison)
gradiri (step)
Put down the snake and step away from the poison.
And you are right about it’s being venenum not venemum.
Aquinas offers that faith is assent of the intellect directed by will to something one does not know. (or something like that.) Article 1, Question 2, II-IIae “Whether to believe is to think with assent?” Short answer: Yes. But it’s to do so about something you don’t know.
Directed by whose will? A determinist would claim it's the particular physical arrangement of the individual's rational machinery that provided the apparent function of will. The Calvinist would claim it was god's will. A person who believes in free will would claim that the will must be the individual's will. Will though is a rather imprecise, arbitrary and thus useless term, when describing how decisions and actions are caused.