yathā yo dadhyarthī sa kṣīropādānaṃ karoti natu kṣīrārthī dadhyupādānam tathā gavārthī nāśvam upādatte nāpyaśvārthī gām /
For instance, one who desires curd obtains milk [as material cause], but one who desires milk does not obtain curd; similarly, one who desires a cow does not obtain a horse, nor does one who desires a horse obtain a cow.