1.Bodhicitta [ that is, the desire for enlightenment] is like a seed because from it grows all the truths of Buddhism. 2.It is like a farm because here are produced all things of purity for the world. 3.The bodhicitta is like the earth because all the worlds are supported by it. 4.It is like WATER because all the DIRT of the PASSIONS is thereby CLEANSED.