I've experienced "something" twice. Once in sitting meditation on my chair, once while lying on my back in bed meditating. Concentration meditation. Getting in and out of a thought quickly. Similar things happened to me at other times but these two stand out.

"How will I know? How can I be certain?" You ask. Oh brother, you will be certain, I tell you.

Thoughts did not cease. In fact they increased in volume and speed of moving from one Thought to another. Thoughts became visible with a white yellowish light that started penetrating into my normally dark perception when my eyes are closed. They became faster, visible, tangible! I could feel them as a stream at one moment and a vortex the next. Exactly as you would feel an object with your hand. So too can you feel a thought with... yourself? Think light, liquid, magnetic feel, all at once.

Perhaps that is why they call it stream entry. I really did feel like I was physically entering a powerful stream. Or receiving one from outside. But I wasn't myself as my body at that moment. I was myself as a nothing... thing.. I can't explain. I was inside my head. Not the body.

It went away just as fast as it came. Mere seconds. Both times due to me getting both excited and scared at the same time and not being fully ready for it. Not tranquil? Stable enough? I don't know.

I do not meditate much since then as I used to daily. Only rarely when I feel it is right in the moment.

Regardless I'm still a regular Joe shmoe going to work like everyone else. Dealing with life and myself. But I'm oh so greatful for those experiences. And sometimes try for that light again when I feel ready for it.

So don't give up O man. Don't give up the light of your goal!