Cow Milk and God :

The milk of the cow in reality pervades the whole body of the animal through its blood,

but you cannot milk it by squeezing the ears or the horns;

you can get the milk only from the teats.

Similarly,

God pervades the universe everywhere,

but you cannot see Him everywhere.

He manifests Himself more readily in sacred temples,

which are full of the spirit of devotion diffused by the life and spiritual practices of the devotees of former times.

Sayings of Sri Ramakrishna,