The _Serious Call_ had an immediate and strong influence on many thoughtful men, and Law's book stimulated in no common measure the religious life of the country. John Wesley spoke of it as a treatise hardly to be excelled in the English tongue 'either for beauty of expression, or for justness and depth of thought.' Whitefield, Venn, and Thomas Scott, the commentator, acknowledged their indebtedness to the work, and Dr. Johnson, speaking of his youthful days, said: 'I became a sort of lax _talker_ against religion, for I did not much _think_ against it; and this lasted till I went to Oxford, when I took up Law's _Serious Call to a Holy Life_, expecting to find it a dull book (as such books generally are), but I found Law quite an over-match for me; and this was the first occasion of my thinking in earnest.' The first Lord Lyttelton, the historian and friend of Thomson, is said to have taken up the book one night at bed-time, and to have read it through before he went to bed; but, perhaps, the most unimpeachable evidence in its favour comes from the pen of Gibbon, who writes: 'Mr. Law's precepts are rigid, but they are founded on the Gospel. His satire is sharp, but it is drawn from the knowledge of human life, and many of his portraits are not unworthy of the pen of La Bruyère. If he finds a spark of piety in his reader's mind he will soon kindle it to a flame.' Law's art as a portrait painter will be seen in the following sketch of Flavia: '_Flavia_ would be a miracle of piety if she was but half so careful of her soul as she is of her body. The rising of a _pimple_ on her face, the sting of a gnat, will make her keep her room two or three days, and she thinks they are very rash people that do not take care of things in time. This makes her so over careful of her health that she never thinks she is well enough, and so over indulgent that she never can be really well. So that it costs her a great deal in sleeping draughts and waking draughts, in spirits for the head, in drops for the nerves, in cordials for the stomach, and in saffron for her tea.