Another handy feature on the S4 is that in certain apps (Messaging is one of them), when you are ready to paste text, pressing and holding brings up a little dialog with Paste and Clipboard. Tapping Clipboard will open a little scrollable window with the last 20 items that were copied to the clipboard. Tap one of them to paste. This could allow you, for instance, to copy items from several different messages to the cliplboard and then paste them into one other message, or into a memo or Calendar event.