There's a quieter kind of strength in this one that doesn't announce itself. We often think of wisdom as knowing when to fight back, but Angelou is pointing at something subtler: wisdom is also knowing when not to. Not because you're weak, but because you've decided your enemy status isn't worth renting space in your own head.
The second part is where it gets interesting. "Refusing to be anyone's victim" doesn't mean bad things won't happen to you—they will. It means you don't accept the internal story that what happened defines you or decides who you get to become. It's the difference between acknowledging a hurt and letting it write your future. When someone wrongs you, you can see it clearly without making it your whole identity. You can be affected without being diminished.
What makes this actually practical is that these two things work together. When you stop needing to make someone your enemy, you also stop giving them the power to victimize you. You're not waiting for their apology or validation to move forward. You're not staying angry as proof of your own dignity. That's where the real freedom sits—not in being nice to everyone, but in deciding that your peace is more valuable than your resentment.