Normally I just post whatever I get from the "Random Sutta" button on dhammatalks.org, but I came across this in my studies yesterday, and thought it's worth sharing.

The Ocean (1): Samudda Sutta (SN 35:187)

“‘The ocean, the ocean,’ says the uninstructed run-of-the-mill person. But that’s not the ocean in the discipline of the noble ones. It’s a great mass of water, a great body of water.

“The eye is a person’s ocean, and its current consists of forms. Whoever resists that current consisting of forms is said to have crossed over the ocean of the eye with its waves, whirlpools, sharks, & demons. Crossed over, gone beyond, one stands on high ground, a brahman.

“The ear is a person’s ocean…

“The nose is a person’s ocean…

“The tongue is a person’s ocean…

“The body is a person’s ocean…

“The intellect is a person’s ocean, and its current consists of ideas. Whoever resists that current consisting of ideas is said to have crossed over the ocean of the intellect with its waves, whirlpools, sharks, & demons. Crossed over, gone beyond, one stands on firm ground, a brahman.”

That is what the Blessed One said. When the One Well-gone had said that, he—the Teacher—said further:

Whoever crosses over this ocean,
with its danger of sharks, demons, waves,
so very hard to cross
is called:
　an attainer of wisdom
　who has lived the holy life,
　one who’s attained the end of the cosmos,
　one gone beyond.

See also: MN 67; SN 15:3; SN 35:197; AN 4:5