As soon as God, by his in-dwelling presence, becomes the inspiration and life of the soul, he inspires in it those thoughts and feelings, and those only, which are appropriate to the present time. To every moment of time there is but one mental state which is suited. Between the circumstances of the time and the correspondent attributes of the mental state there is, and necessarily must be, a relationship as wise as infinite wisdom, and as perfect as infinite adjustment. God himself cannot alter it, because he cannot deviate from the perfect to the imperfect. God, therefore, as the infinite giver, (that is to say, when he is allowed to be and is accepted as the infinite giver,) can give only what he does give; and can give it only at the present time. The life, therefore, which we live in God, is and can be only life by the moment. The stream flows forever, but it strikes upon the soul only at the given time.
The man who thus consecrates himself to God, and, in the exercise of faith, puts himself in the line of divine communication, so that he receives from God his knowledge, his feeling, and his purpose, is the truly holy man, because he is the whole man.
— edited from A Treatise on Divine Union (1851) Part 7, Chapter 10 by Thomas Cogswell Upham. You can find more of his work at the blog, The Hidden Life, managed by Craig L Adams at: http://thomascupham.blogspot.com