The second is working to concentrate easily without emotion.

They are really one and the same.
If we work to drop everything that interferes, we are so constantly relaxing in order to concentrate that the very process drops strain bit by bit, little by little.
An unquiet mind, however, full of worries, anxieties, resistances, resentments, and full of all varieties of agitation, going over and over things to try to work out problems that are not in human hands, or complaining and fretting and puzzling because help seems to be out of human power, such a mind which is befogged and begrimed by the agitation of its own dust is not a cause in itself--it is an effect.
The cause is the reaching and grasping, the unreasonable insistence on its own way of kicking, dust-raising self-will at the back of the mind.
A quiet will, a will that can remain quiet through all emergencies, is not a self-will.

It is the self that raises the dust--the self that wants, and strains to get its own way, and turns and twists and writhes if it does not get its own way.
God's will is quiet.

We see it in the growth of the trees and the flowers.

We see it in the movement of the planets of the Universe.