The fourth line repeats the second line's gesture and reverses its verdict. Both turn to the height for nourishment. The second is told this brings evil, the fourth that it brings good fortune. Legge's translation supplies the difference in the image that follows, a tiger's gaze fixed downward and steady, with desire that presses on and on, and no fault in any of it. The same act performed from a different position, and with a different quality of attention, becomes a different act altogether.
Three things separate the two lines. This stroke is yielding in an even place, which is correct; it opens the upper trigram Gen, mountain and stillness, so its dependence is held rather than restless; and it stands directly beneath the strong sixth line, which the hexagram treats as the source from which nourishment proceeds. The fourth line therefore looks up to something genuinely above it and genuinely able to provide, whereas the second line looked up to a yielding fifth that had nothing to give.
The tiger's stare is the part of the image that repays attention. It is not a picture of ferocity but of unwavering focus, a gaze that does not wander to whatever else happens to be moving nearby. Set against the envious slack jaw of the first line, this is the hexagram's portrait of legitimate need: fixed on the correct source, sustained without embarrassment, and answered.