In the scriptures there was Hannah who prayed asking for a child, because she was barren, and she asked without saying the words out loud because she was in the public temple and was praying her innermost private thoughts. God still heard her. I guess when I heard this as a child I realised prayer could be silent. I expect my mother told me God hears your thoughts. So I always prayed in my thoughts. Hardly ever in uttered words. Always I received what I asked. Only later in life did I even question this thought praying method. Then years later in my thirties Jesus spoke to me and later He woke me in the night to prove something I had asked about. The method was to bypass my senses and speak directly to me - beyond even my conscious mind. To my spirit or soul, not sure what you’d properly call it. An analogy would be a computer system writing words directly on the hard disk, by passing processors and peripheral devices like keyboard. Astonishing. So you just have to believe what is said or reject it. I received it. Then both times simply acted on it immediately without question, it was so certain it needed no question. Spirit communicates with spirit.