An attempt to prove the affirmative part of that question, whether there be any certainty, that a sinner under the advantages of the gospel and common grace, striving with all his might, and persevering to the last in his utmost endeavours to please God, shall obtain such a measure of divine assistance, as is necessary to fit him for eternal salvation. Or, whether God be a rewarder of all those who diligently seek him? Containing some remarks upon a late piece intitled, A vindication of gospel-truth, and refutation of some dangerious errors, &c