I am a Calvinist; I believe in election and predestination; but I would not dream of putting it under the heading of essential. I put it under the heading of non-essential… You are not saved by your precise understanding of how this great salvation comes to you. What you must be clear about is that you are lost and damned, hopeless and helpless, and that nothing can save you but the grace of God in Jesus Christ and only Him crucified, bearing the punishment of your sins, dying, rising again, ascending, sending the Spirit, regeneration. Those are the essentials… While I myself hold very definite and strong views on the subject, I will not separate from a man who cannot accept and believe the doctrines of election and predestination, and is Arminian, as long as he tells me that we are all saved by grace, and as long as the Calvinist agrees, as he must, that God calls all men everywhere to repentance. As long as both are prepared to agree about these things I say we must not break fellowship. So I put election into the category of non-essentials.
Martyn Lloyd-Jones