Never look after a friend who is leaving you till he is quite out of sight, or you will never see him or her again; but turn your eyes away while he is still visible, that he or she may return.
General in the United States.

Never look after a friend who is leaving you till he is quite out of sight, or you will never see him or her again; but turn your eyes away while he is still visible, that he or she may return.
Source: Current Superstitions (1896), entry 1304.
Fanny D. Bergen, editor.
Modern normalized navigation; the historical attribution above remains unchanged.