like what you said, man is like a cup of liquid taken from a body of water (god). since the water (man) is placed in a cup (flesh), there is an illusion of separateness. the flesh has an egoic mind which creates all kinds of thoughts and emotions to reinforce the division, creating an entity or an individual. since it is limited by the cup, the water associates itself and derives its sense of self with the cup and forgets that it is a part of a body of water. to destroy the illusion, one must remember its connectedness/oneness with god (water). to do that, one must be aware of that we are not the body, the thoughts and the egoic mind (cup). awareness is a state of remembrance of what one is beyond the seeming boundary or limitation of the flesh.
kinda labad ang explanation but hope you get the drift