A quote that has stayed in my mind over many, many years is from the Scottish poet, Robert Burns. In his poem “To A Mouse” he wrote :-
” The best-laid plans o’ mice an’ men
Gang aft a-gley,
An’ lea’e us nought but grief an’ pain
For promised joy.”
You would have noticed in your own work life, that Burns’ words ring true, every now and then. Something will go wrong despite all your plans.