Enchiridion militis Christiani

or, "Handbook of a Christian Knight"
By Desiderius Erasmus

The mortal world a field is of battle

Which is the cause that strife doth never fail
Against man, by warring of the flesh
With the devil, that always fighteth fresh
The spirit to oppress by false envy;
The which conflict is continually
During his life, and like to lose the field.
But he be armed with weapon and shield
Such as behoveth to a christian knight,
Where God each one, by his Christ chooseth right
Sole captain, and his standard to bear.
Who knoweth it not, then this will teach him here
In his brevyer, poynarde, or manual
The love shewing of high Emanuell.
In giving us such harness of war
Erasmus is the only furbisher
Scouring the harness, cankered and adust
Which negligence had so sore fret with rust
Then champion receive as thine by right
The manual of the true christian knight.