Something to think about.
Why Do You Doubt?
38 And He said to them, “Why are you troubled? And why do doubts arise in your hearts? 39 Behold My hands and My feet, that it is I Myself. Handle Me and see, for a spirit does not have flesh and bones as you see I have.” Luke 24:38-39
It was not an apparition, a disembodied spirit or a mass hallucination, it was Christ resurrected in the flesh. It is (present tense) our assurance of salvation.