“And though the pastor is not to act as a searcher of the heart, or a lord of conscience in this affair, ...but... to be helpers of their joy, and promoters of their salvation.”
-Qualifications for communion
And his Resolution 25: "Resolved, to examine carefully, and constantly, what that one thing in me is, which causes me in the least to doubt of the love of God; and to direct all my forces against it."
But how? Jay Bennett probably knows better as he has made Edwards the focus of his studies, but I like hymns, so Newton fills in the gaps vividly for me in "Begone Unbelief": look to Christ, not to your faith or will, by Christ is faith strengthened:
1. Begone unbelief, My Savior is near,
And for my relief Will surely appear:
By faith let me wrestle, with God in the storm
And help me my Savior, the faith to adorn
2. Though dark be my way, Since he is my guide,
'Tis mine to obey, and His to provide;
Though cisterns be broken, And creatures all fail,
The word he has spoken will surely prevail.
3. Why should I complain, Of want or distress
Temptation or pain? He told me no less
The heirs of salvation, I know from his word
Through much tribulation Must follow their Lord
4. Since all that I meet will work for my good,
The bitter is sweet, The medicine food;
Though painful at present, will cease before long,
And then, O! how glorious, The conqueror's song!