“Just as powerful highbred horse
who turns the plow like fire
goes about with little difficulty; 
So do I, day and night,
Go about with little difficulty,
Delighting in the bliss which is beyond this world.” 
 “Yathāpi bhaddo ājañño, naṅgalāvattanī sikhī; Gacchati appakasirena,
 evaṁ rattindivā mama; Gacchanti appakasirena, sukhe laddhe nirāmise”ti. This Nirāmise sukhe is the same as the Buddha describes in MN118 Ānāpānāssati Sutta.