“Chance fights ever on the side of the prudent.”
Pirithous
Variant: Fortune truly helps those who are of good judgement.
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Euripidés 116
ancient Athenian playwright -480–-406 BCRelated quotes

Schumacher (2007) " Schumacher applauds ‘super-performance’ http://www.indianexpress.com/news/schumacher-applauds--superperformance-/231184/ Reuters : Berlin, october 22, Mon Oct 22 2007
Intro of this article mentions: "Seven times world champion Michael Schumacher has congratulated Kimi Raikkonen for winning the world championship for Ferrari on Sunday with a stirring fight to the wire."
“Kosovo and Taiwan, as two democratic countries, will fight against authoritarianism side by side.”
Source: Blerta Deliu-Kodra (2021) cited in " Taiwan, Kosovo parliamentary groups formed to boost bilateral ties https://focustaiwan.tw/politics/202112210007" on Focus Taiwan, 21 December 2021.

“Now, to-day, this moment, is our chance to choose the right side.”
Book II, Chapter 5, "The Practical Conclusion"
Mere Christianity (1952)
Context: Now, to-day, this moment, is our chance to choose the right side. God is holding back to give us that chance. It will not last for ever. We must take it or leave it.

“Opinions cannot survive if one has no chance to fight for them.”
Source: The Magic Mountain (1924), Ch. 6

“No man was ever wise by chance.”

“As it says in the Bible, God fights on the side with the heaviest artillery.”
Source: The Moon is a Harsh Mistress

“Something must be left to chance; nothing is sure in a sea fight above all.”
Before the battle of Trafalgar [citation needed]
The Battle of Trafalgar (1805)