This is the section for one wishing to retrieve those 'bright moments':
"If the question is—How are these bright moments to be prolonged, renewed, or retrieved? We are directed to faith and diligence. A careful use of the appointed means of grace, a watchful endeavor to avoid the occasions and appearances of evil, and especially assiduity in secret prayer, will bring us as much of them as the Lord sees good for us. He knows best—why we are not to be trusted with them continually. Here we are to walk by faith, to be exercised and tried; by and by we shall be crowned, and the desires he has given shall be abundantly satisfied!"
[From The letters of John Newton Page 119]