A poet says:

mā lā yakūnu fa lā yakūnu bi ĥīlatin
abadan wa mā huwa kāyinun sayakūnu
sa yakūnu mā huwa kāyinun fī waqtihī
wa akhul jahālati mutábun maĥzūnu
fa laálla mā takhshāhu laysa bi kāyinin
wa laálla mā tarjūhu laysa yakūnu
yasaál qawiyyu fa lā yanālu bi saáyihi
ĥažžan wa yaĥžā áājizun wa mahīnu

That which is not ordained, will never come to pass.
The predestined shall be; and needs it not a cause.
The fated will be indeed, but at the time assigned
The unaware are strain'd; to grief they are consigned
It's likely what you fear, may never come to be –
Your hopes of gaining which, mayhap you'll never see
The strong and best cannot, by sweat or skill obtain
Such fortunes weak and low; through sheer luck attain