Final answer:
Bonaventure fused Augustinian ideas with Aristotle in his belief about nature and seeking truth. He argued that God is the source of all knowledge, and that knowledge is acquired through reasoning and observation. Certainty about this knowledge is obtained through inner reflection or meditation.
Step-by-step explanation:
Bonaventure, a Franciscan friar from Italy, fused Augustinian ideas with Aristotle in his belief about nature and seeking truth. In his illumination argument, Bonaventure argued that God is the source of all knowledge and that knowledge of the divine truth is impressed on every soul. He believed that the acquisition of knowledge proceeds from the effect, the outward world that we observe, to its cause, which is God. Bonaventure emphasized that knowledge is acquired through reasoning and the use of abstract ideas, propositions, and observed correlations. However, certainty about this knowledge can only be obtained through Augustine's process of inner reflection or meditation, through which one sees the unchangeable divine light.