“Youth, what man's age is like to be doth show,
We may our ends by our beginnings know.”
Of Prudence, line 225.
“Ambition is like love, impatient
Both of delays and rivals.”
The Sophy: A Tragedy, Act I, scene ii.
“We're ne'er like angels till our passion dies.”
Not by Denham, as often stated, but by Thomas Dekker. It is in his The Honest Whore Part 2, Act I, scene 2.
Misattributed
“Actions o' th' last age are like almanacks o' th' last year.”
The Sophy: A Tragedy (1642), Act I, scene ii.
Source: Of Prudence (1668), line 225