Look at Romans 8:32:
“He that spared not His own Son, but delivered Him up for us all, how shall He not with Him also freely give us all things?”
If He gave us His Son, will He not give us the certainty that He is ours. I have heard this illustration. There was a man who owed $10,000, and would have been made a bankrupt, but a friend came forward and paid the sum. It was found afterwards that he owed a few dollars more; but he did not for a moment entertain a doubt that, as his friend had paid the larger amount, he would also pay the smaller.
And we have high warrant for saying that if God has given us His Son He will with Him also freely give us all things; and if we want to realize our salvation beyond controversy He will not leave us in darkness.
Again in the 33rd verse:
“Who shall lay anything to the charge of God’s elect? It is God that justifieth. Who is he that condemneth? It is Christ that died, yea rather, that is risen again, who is even at the right hand of God, who also maketh intercession for us. Who shall separate us from the love of Christ? shall tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword? As it is written, For Thy sake we are killed all the day long; we are accounted as sheep for the slaughter. Nay, in all these things we are more than conquerors through Him that loved us. For I am persuaded that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.”