diff --git a/packages/dito/app/components/AbsatzRenderer.tsx b/packages/dito/app/components/AbsatzRenderer.tsx
new file mode 100644
index 00000000..34bbebe4
--- /dev/null
+++ b/packages/dito/app/components/AbsatzRenderer.tsx
@@ -0,0 +1,84 @@
+import { BlocksContent } from "@strapi/blocks-react-renderer";
+import { ReactElement } from "react";
+
+type InternalNode = {
+  type: string;
+  children: (TextNode | InternalNode)[];
+  format?: "unordered" | "ordered";
+};
+type TextNode = { type: "text"; text: string };
+
+const isInternalNode = (node: InternalNode | TextNode): node is InternalNode =>
+  node.type !== "text";
+
+/* Splits a string containing custom <1>...</1> markup into HTML elements.
+ * Replaces the tags for the relevant principles with <mark> elements.
+ * Returns the rest as <spans>.
+ */
+const renderTextWithMarks = (
+  text: string,
+  principlesToFilter: number[],
+): ReactElement[] => {
+  const parts = text.split(/(<\d>.*?<\/\d>)/g);
+  return parts.map((part, index) => {
+    const match = part.match(/^<(\d)>(.*?)<\/\1>$/);
+    if (match) {
+      const num = match[1];
+      const content = match[2];
+      return principlesToFilter.includes(Number(num)) ? (
+        <mark key={index} className="bg-yellow-500">
+          {content}
+        </mark>
+      ) : (
+        <span key={index}>{content}</span>
+      );
+    }
+    return <span key={index}>{part}</span>;
+  });
+};
+
+/* Traverses the tree structure of Strapi BlockContent and renders the elements as nodes.
+ * Internal nodes have children, for which the renderNode function is called recursively.
+ * Leaf nodes are TextNodes, whose string content will be transformed by renderTextWithMarks.
+ * Only supports a very limited set of Strapi BlockEditor elements.
+ */
+// TODO: check nested lists
+// TODO: write tests
+const renderNode = (
+  node: InternalNode | TextNode,
+  principlesToFilter: number[],
+  index: number,
+): ReactElement | ReactElement[] => {
+  if (isInternalNode(node)) {
+    const children = node.children.map((child, index) =>
+      renderNode(child, principlesToFilter, index),
+    );
+    switch (node.type) {
+      case "paragraph":
+        return <p key={index}>{children}</p>;
+      case "list":
+        return node.format === "ordered" ? (
+          <ol key={index}>{children}</ol>
+        ) : (
+          <ul key={index}>{children}</ul>
+        );
+      case "list-item":
+        return <li key={index}>{children}</li>;
+      default:
+        return <>{children}</>;
+    }
+  }
+  return renderTextWithMarks(node.text, principlesToFilter);
+};
+
+export default function AbsatzRenderer({
+  text,
+  principlesToFilter,
+}: {
+  text: BlocksContent;
+  principlesToFilter: number[];
+}) {
+  return text.map((block, index) =>
+    renderNode(block, principlesToFilter, index),
+  );
+}
diff --git a/packages/dito/app/components/ParagraphList.tsx b/packages/dito/app/components/ParagraphList.tsx
index 760b1389..0b4b9db5 100644
--- a/packages/dito/app/components/ParagraphList.tsx
+++ b/packages/dito/app/components/ParagraphList.tsx
@@ -1,16 +1,8 @@
 import DetailsSummary from "@digitalcheck/shared/components/DetailsSummary.tsx";
 import Heading from "@digitalcheck/shared/components/Heading.tsx";
-import {
-  type BlocksContent,
-  BlocksRenderer,
-} from "@strapi/blocks-react-renderer";
+import { BlocksRenderer } from "@strapi/blocks-react-renderer";
 import type { Paragraph, Prinzip } from "../utils/strapiData.server.ts";
-
-const AbsatzRenderer = ({ text }: { text: BlocksContent }) => {
-  const blockOutput = BlocksRenderer({ content: text });
-  console.log("AbsatzRenderer", blockOutput);
-  return blockOutput;
-};
+import AbsatzRenderer from "./AbsatzRenderer.tsx";
 
 function Paragraph({
   paragraph,
@@ -46,7 +38,12 @@ function Paragraph({
             <DetailsSummary
               title={`Absatz ${index + 1}`}
               open={absatz.PrinzipErfuellungen.length > 0}
-              content={<AbsatzRenderer text={absatz.Text} />}
+              content={
+                <AbsatzRenderer
+                  text={absatz.Text}
+                  principlesToFilter={principleNumbers}
+                />
+              }
             />
           </div>
         ))}