...to the need to seek students with whom there is a "karmic connection"; the point is that the bodhisattva cannot always be helpful to everyone, and so one should direct one's efforts at those who are already predisposed to one.
...in order to pinpoint individuals with whom there is a "spiritual resonance"; the crucial point is that the bodhisattva cannot always be helpful to everyone, and thus one should concentrate on those who are already predisposed to them.