Walking the plank 
was a form of punishment thought to have been practiced on special occasion by
pirates, mutineers, and other rogue seafarers. 
For the amusement of the perpetrators (and the
psychological torture of the victims), 
captives were forced to walk off a wooden plank or beam extended over the side of a ship, until falling into the water.

Rom 7:14	For we know that the law is spiritual: but I am carnal, sold under sin.
	Rom 7:15	For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.
	Rom 7:16	If then I do that which I would not, I consent unto the law thatit is good.
	Rom 7:17	Now then it is no more I that do it, but sin that dwelleth in me.
	Rom 7:18	For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not. to be dominated by the sin nature for the Christian is to walk the plank God's plan for every believer is freedom  Rom 6:14 For  sin  shall not  have dominion  over you:  for ye are not under the law,  but under grace.  Rom 6:11 Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.  Rom 6:13 Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members asinstruments of righteousness unto God.  Psa 32:6 For this shall every one that is godly pray unto thee in a time when thou mayest be found: surely in the floods of great waters they shall not come nigh unto him.  Psa 32:7 Thou art my hiding place; thou shalt preserve me from trouble; thou shalt compass me about with songs of deliverance. Selah.