There is not enough medical knowledge available to make that statement. Memories may only be rendered "innaccessible" and not destroyed! Some things you will never remember unless brought on by using things like drugs or hypnotherapy sessions!
The spirit can be weaker than the body yes. For people of the mudane low brow secular beliefs this is the case! But for those who seek strength of spirit they are swayed by such effects. Those with a spirit stronger than the flesh can overcome such things!
Did you just magically forget I was a Christian? There are references all over the Bible about this sort of thing! Strengthen the Spirit so that the flesh does not rule over you! Instead make your Spirit strong so that your flesh instead yeilds to it!
This tenet is not just in the realm of Chrsitianity! Almost all of the Eastern Arts of Mysticism are all based on these tenets! They strengthen Mind, Body, and Spirit! You will find that their emotions are not manipulated so easily!
Your soul is what is judged... therefore the warning of making it strong and not the body! It is unwise to be lead by the weak, because it will only be destroyed, and carries the risk of it clutching what may have been strong to death with it!