It seems evidently, however, to be no greater than what is sufficient to compensate the superior expense of their education.

然而，这似乎显然不超过足以补偿他们教育的高额费用的金额。

The profit, he said, would not compensate the expense of a stone-wall: and bricks (he meant, I suppose, bricks baked in the sun) mouldered with the rain and the winter-storm, and required continual repairs.

他说，利润不会补偿石墙的费用：砖块（我想他的意思是在阳光下烘烤的砖块）会随着雨水和冬季风暴而发霉，需要不断修理。