Robert Greene

you have more to fear from friends than from enemies

Be wary of friends—they will betray you more quickly, for they are easily aroused to envy.

Men are more ready to repay an injury than a benefit, because gratitude is a burden and revenge a pleasure. Tacitus, c. a.d. 55-120

Friends often agree on tilings in order to avoid an argument. They cover up their unpleasant qualities so as to not offend each other. They laugh extra hard at each odier's jokes. Since honesty rarely strengthens friendship, you may never know how a friend truly feels. Friends will say that they love your poetry, adore your music, envy your taste in clothesmaybe they mean it, often they do not.

Strangely enough, it is your act of kindness tiiat unbalances everything.

Seducers know that the possibility of pleasure will make a person follow them, and the experience of it will make someone open up, weak to the touch. They also train themselves to be sensitive to pleasure, knowing that feeling pleasure themselves will make it that much easier for them to infect the people around them.

In ancient China this was called “giving before you take”—the giving makes it hard for the other person to notice the taking

he replied that he had executed not an old friend but a new enemy

You cannot announce your intentions or reveal them directly in words.

once it slips, however, you are vulnerable, and will be attacked on all sides.