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*The Meaning of Relativity*of 1921 p48 when deriving Field Equations :

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**We must next attempt to find the laws of gravitational field .For this purpose ,Poisson's equation of the Newtonian theory must serve as a model.**I have three question:

1\ How to derive Poisson's Equation from Newtonian theory?

2\How to use Poisson's Equation to derive Einstein's Field Equations?

3\ If Newtonian theory is not correct (as implied by GR) and poisson's Equation is derived from (or equavilant to) Newtonian theory ,then is it correct to use it to derive anything ?