If I should die, think only this of me:
That there's some corner of a foreign field
That is for ever England.  There shall be
In that rich earth a richer dust concealed;
A dust whom England bore, shaped, made aware,
Gave, once, her flowers to love, her ways to roam,
A body of England's, breathing English air,
Washed by the rivers, blest by suns of home.
And think, this heart, all evil shed away,
A pulse in the eternal mind, no less
Gives somewhere back the thoughts by England given;
Her sights and sounds; dreams happy as her day;
And laughter, learnt of friends; and gentleness,
All the evil of the world faced by the soldier will be forgotten in his afterlife. 
 Once the ‘pulse’ of purification has passed the the speaker can bask in joy. 
 The idea of ‘eternal mind’ is interesting, a  Pantheistic  view that there is a merging of souls with God’s universal presence, though this is an over-simplification.
The Soldier