It never fails. The jar or squeeze bottle of liquid honey in the pantry will eventually turn into a thick, crystalized mass. Sometimes this change happens quickly, and sometimes it takes longer. It’s still safe to eat once it crystalizes, but it’s not as easy to use for baking (where precise liquid measurements are required), for stirring into a beverage or for many other applications.
Thankfully, honey can be returned to its liquid state with little effort. Heat some water in a pot, and put your honey container in the pot of hot water until the honey turns liquid. This gentle transfer of heat to the honey helps bring it back to liquid form without overheating the honey. With time, the honey will crystalize again, but reheating it with the same hot water bath technique will once more return it to liquid form.
If this cycle of crystalizing and heating is annoying to you, consider buying smaller quantities of honey so you can use them up within a reasonable timeframe.