I have 4 favorite sayings - all but one from songs.
"life is so brief and time is a thief when you're undecided" from Young Hearts sung by Rod Stewart
"Once upon a time I was falling in love, now I'm only falling apart" from Total Eclipse of the Heart sung by Bonnie Tyler
In reference to love - "I don't care what consequence it brings, I have been a fool for lesser things", from The Longest Time sung by Bill Joel
And finally a quote from a co-worker's grandmother - "It's like trying to set fire to wet mule".