There is nothing closer to “vigorous effort (kyoujo)” than seeking benevolence (jin). What sort of teaching of kindness is this? Learning begins when studying a great cause, one thinks of the feelings of others, rather than doing things only for yourself. This is the way of vigorous effort.
The Third Year of Ansei, The Fourteenth of May. “Minutes of the Head Lecturer.”
Confer Mencius: (Not my translation)
Jin Xin I: Mencius said, ‘All things are already complete in us. There is no greater delight than to be conscious of sincerity on self-examination. If one acts with a vigorous effort (kyoujo) at the law of reciprocity, when he seeks for the realization of perfect virtue, nothing can be closer than his approximation to it.’