there are no birds in last year's nest

/ðeəɹˌɑː nˈəʊ bˈɜːdz ɪn lˈast jˈiəz nˈɛst/

/ðɛɹˌɑːɹ nˈoʊ bˈɜːdz ɪn lˈæst jˈɪɹz nˈɛst/

used to suggest that conditions and circumstances are always changing, and that relying on past successes or achievements is not a guarantee of future success