In plain words
A crystal appears differently according to what is placed beside it. So different minds lend you an appearance of difference. O complete one, the moon seems to move in water: the mind's movement likewise lends you an appearance of movement.
Word for word
Because of different limiting adjuncts, a crystal appears in different ways; because of different intellects, variety appears in you also. O complete one, take the movement of the moon in water as the illustration: because of the moving intellect, movement appears in you also.