If you are looking for something like, "What is fated will occur", you could try the following proverb:
ducunt volentem fata, nolentem trahunt
Fate leads the willing, and drags the unwilling.
or I would hazard a translation such as
fatum numquam falletur
(Fate is never cheated)
I am not an expert, but I think there are some Scandinavian proverbs along this line too, eg
en engi má við sköpum vinna.
but no one can withstand his fate.
If you are looking for something like, "I will accept whatever comes to pass", you could try Matthew 6:34
nolite esse solliciti in crastinum
take no thought for the morrow...