The metaphor of “canceled” in line 7 brings out a comparison of banking and life. The act of loving leads to uncertainties, which become a sort of indebtedness, but with the passage of time and forgetfulness, these woes have become canceled. During the time of sweet silent thought, however, the speaker revives his past woe which then brings back his previous grief. The idea of the metaphor of “expense” is that living requires the expenditure of love and care, and with death and absence the expense vanishes. The same thing happens in the retrospection described by the speaker. The losses of the vanished sight are once again brought into the speaker’s mind, and are lamented even yet again.