As to the second mode, that of leaving wealth at death for public uses, it may be said that this is only a means for the disposal of wealth, provided a man is content to wait until he is dead before it becomes of much good in the world. Knowledge of the results of legacies bequeathed is not calculated to inspire the brightest hopes of much posthumous good being accomplished. The cases are not few in which the real object sought by the testator is not attained, nor are they few in which his real wishes are thwarted.
before it becomes of much good in the world.
I knew that "become of" expression is used only when the subject is what or whatever. but in this article, the subject of that expression is pronoun "it" Is it possible? and I don't know that that means. And Could I ask you what the pronoun "it" refer to?