Akademik

Одной надеждой не проживешь
What you expect to have in future cannot satisfy you if you need it at pre sent. See С одной надежды не сшить одежды (C)
Cf: Don't feed yourself on false hopes (Am.). Не that lives upon hope will die fasting (Am.). Hope is a good breakfast, but a bad supper (Am.). Hope is a good breakfast, but it is a bad supper (Am., Br.). Hope is a slender reed for a stout man to lean on (Am.). Hope is the poor man's bread (Am.). Who lives by hope will die by hunger (Br.)

Русско-английский словарь пословиц и поговорок. . 2013.