No man can tell what the future may bring forth, and small opportunities are often the beginning of great enterprises. —  Demosthenes, Ad Leptinem, 162 Harbottle, Thomas Benfield (1897) Dictionary of Quotations (Classical).  London: S. Sonnenschein & co, p. 51.  Digitally archived at https://archive.org/details/dictionaryofquot00harbiala/page/511/mode/2up, accessed 12 September 2021.