"You'll never go poor taking a profit"
Not on any single trade, but within a strategy taking profits too early without good reason is a sure road to ruin.
It is easy to have plenty of profits relative to losses, just take any liquid security and trade at random, define a stop to take a profit, say Price + X and a stop to take a loss say Price - (3 times X). Keep on repeating.
You will gets lots of profitable trades this way, far more than the losing ones, but overall you will lose money. So one must define how the profits relate to the losses. Many profitable strategies have less profitable trades than losing trades but the average magnitude of the profitable trades are far larger than the average losing trade (the opposite of above) a variation on the run profits cut losses theme. This is psychologically more difficult to do than snapping at profits.