Traditionally in systems like D&D and Pathfinder, Wisdom is more representative of inherent common sense, awareness, and intuition and Intelligence representative of the ability to reason and learn. What actually represents accumulated knowledge is your bonus in the related skill, which is a combination of ranks (representative of time spent training/studying that skill) plus inherent bonus (in the case of knowledge, usually Intelligence since Int is representative of your ability to learn).

Some skills end up seeming like they should be a bit of both though. For example, Healing/Medicine requires knowledge of anatomy, ailments, treatments, etc (which would be Int aligned) but actually diagnosing and using it requires perception to recognize symptoms and often some intuitive choices about how best to treat ailments (which is more Wisdom aligned). It's simpler to just pick one, and often Wisdom is chosen to avoid too many things being Int.