"The Bible gives no quarter to unbelief or doubting. It does not call it humility. It does not teach us to think better of ourselves for doubting. It does not countenance uncertainty or darkness."
"Thus the questions about assurance resolve themselves into that of the knowledge of our relationship to God. To an Arminian, who denies election and the perseverance of the saints, the knowledge of our present reconciliation to God might bring with it no assurance of final salvation; for; according to him, we may be in reconciliation today, and out of it tomorrow; but to a Calvinist there can be no such separation. He who is once reconciled is reconciled for ever; and the knowledge of filial relationship just now is the assurance of eternal salvation. Indeed, apart from God's electing love, there can be no such thing as assurance. It becomes an impossibility."
"For we are not saved by believing in our own salvation, nor by believing anything whatsoever about ourselves. We are saved by what we believe about the Son of God and His righteousness. The gospel believed saves; not the believing in our own faith. Nevertheless, let us know that assurance was meant to be the portion of every believing sinner. It was intended not merely that he should be saved, but that he should know that he is saved, and so delivered from all fear and bondage, and heaviness of heart."
Lot's of em!