the best-laid plans go astray
Definition:  you can make the best preparations, but things might not go according to plan
Usage:  after presenting my business plan, the company agreed to fund it, however two days down the line they pulled out due to austerity measures; this proves that the best-laid plans go astray

SEPEDI
Translation:  maano ao a beilwego gabotse a ikela thoko
Proverb: morei wa kgwale ga se motanyi wa yona

XITSONGA
Translation:  makungu lama andlariweke kahle ma hambuka
Proverb: nkawa wa tsandzeka ku khandziya murhi

TSHIVENḒA
Translation:  maano o vhekanywaho zwavhuḓisa a a pambuwa
Proverb: mare o humela khanani