So that, whoever wishes may take admonition thereof.
For those who wish to take heed.
So, whoever wills, will remember it
So whoever pleases may mind it
So who wanted/intended remembered it
Let those who wish understand it
So whoever wills may heed advice from it
Let him, then, who will, remember it
So whoever wills may remember it
Let him then, who will, remember it (to win glory and honour for himself)
So whosoever will (let him read it), and receive admonition (from it)