1 John 1:1 is a pivotal statement of personal witness about the veracity of what John is writing about and the truth about Jesus whom he calls, "The Word of Life". It contains four verbs:
- ἀκούω (akouó) = to hear, listen
- ὁράω (horaó) = to see (in this case it is literal see with the eyes as the text states)
- θεάομαι (theaomai) = to see in a prolonged way, ie, gaze intently upon and thus to perceive, probably, by contrast with the above, to meditate upon and thus to have studied and understood
- ψηλαφάω (psélaphaó) = to touch (in this case, with the hand as the text states)
Note that NT Greek has about 11 verbs denoting "seeing" in some sense. The two here are contrasted above as literal biological seeing vs a prolonged look that studies the object in a concentrated way and thus implies an intellectual perception.
Thus, John is saying that his personal experience (and that of his fellow apostles) can witness to the reality of the truth of Jesus Christ, the "Word of Life", precisely because he has heard, seen with his eyes, studied/perceived in an extended way, and even touched with his hands, the person of Jesus Christ.