Most of us when trying to thread a needle will get the thread wet in order to pass it more easily through. However, sewing blog BeSewStylish.com suggests that you wet the eye of the needle instead.
Most sewers intuitively wet the thread when trying to thread a needle. But wait! If you wet the eye of the needle instead, you’ll find it’s suddenly easier to get the thread through that tiny hole. Turns out that the capillary action of the moisture draws the thread through.
I tried this myself and got pretty equal results either way I tried it, but it’s certainly worth a try for those more stubborn sewing jobs.