When we observe the wisdom of previous generation, we wonder how it is that Hashem gave them such abundance of Torah. Surely Hashem could give us no less if we were worthy. The answer is that the previous generations were whole-heartedly dedicated to the Torah, and worldly possessions were insignificant in their eyes. Even after they amassed wisdom, they would travel for years to acquire more. Hashem reciprocated by opening their eyes and hearts to plumb the depths of His wisdom. In our generation we spend much less effort, and the results are proportionate to our investment.