4.
The Discourse on Concentration as Root and Readiness
665.
At Sāvatthī.
"Monks, there are these four meditators.
Which four?
Here, monks, a certain meditator is skilled in concentration regarding concentration, but not skilled in readiness regarding concentration.
Here again, monks, a certain meditator is skilled in readiness regarding concentration, but not skilled in concentration regarding concentration.
Here again, monks, a certain meditator is neither skilled in concentration regarding concentration, nor skilled in readiness regarding concentration.
Here again, monks, a certain meditator is both skilled in concentration regarding concentration and skilled in readiness regarding concentration.
Therein, monks, the meditator who is both skilled in concentration regarding concentration and skilled in readiness regarding concentration is the foremost and the best and the chief and the highest and the most excellent among these four meditators.
Just as, monks, from a cow comes milk, etc.
and the most excellent."
The fourth.