Quotation style
We must be accurate but not pedantic in quotations. Always, your thought should be on what the reader needs to accurately and smoothly comprehend what the original was saying.
Formatting. This can be changed, usually. Consider, from Wikipedia's Kairos:
"Kairos" (used 86 times in the New Testament)[19] refers to an opportune time, a "moment" or a "season" such as "harvest time," [20] whereas "chronos" (used 54 times)[21] refers to a specific amount of time, such as a day or an hour (e.g. Acts 13:18 and 27:9).
This is better done as
"Kairos" (used 86 times in the New Testament) refers to an opportune time, a "moment" or a "season" such as "harvest time," whereas "chronos" (used 54 times) refers to a specific amount of time, such as a day or an hour (e.g. Acts 13:18 and 27:9).
Although proper in legal briefs, where exactitude is more important than clarity, in other contexts it is pedantic to write:
"Kairos" (used 86 times in the New Testament) refers to an opportune time, a "moment" or a "season" such as "harvest time," whereas "chronos" (used 54 times) refers to a specific amount of time, such as a day or an hour (e.g. Acts 13:18 and 27:9). [citations omitted]
Omitted words. If you omit the first words of a sentence, the pedantic style, one proper for legal brief but not for other writing, including scholarly writing, is to indicate that like this one from Wikipedia's Kairos:
"... [T]he word refers more to proportion, the mean, and the implicit sense of right measure."
It is better just to change without indication, because the reader is distracted by the bracketed original letter and in 99.99% of cases he doesn't care that you omitted the first word. If you think he would care, then tell him about it in a footnote instead, like this:
"The word refers more to proportion, the mean, and the implicit sense of right measure."<ref> Wikipedia, Kairos, viewed Boxing Day, 2020. The original says, "Here the word refers more to proportion, the mean, and the implicit sense of right measure."</ref>