Concentrate all your thoughts upon the work at hand. The sun’s rays do not burn until brought to a focus. – Alexander Graham Bell Orison Swett Marden, (1901) “Bell Telephone Talk”, How They Succeeded. Boston: Lothrop Publishing Company, p. 38. Digitally archived at https://archive.org/details/howtheysucceeded00mardrich/mode/2up, accessed 11 September 2021.