If we were walking along a narrow path in semi-darkness and were to see what seems to be a snake lying on the path ahead of us, we would be afraid to proceed any further and would wait till the snake had moved away. However, if after waiting for a while we see that the snake does not move, we may begin to suspect that it is not actually a snake, in which case we would cautiously move forwards to look at it more closely and carefully. If it were not actually a snake but only a rope, our investigation or close inspection of it would reveal to us that what we had been looking at and afraid of all along was only a rope, so our fear of it would dissolve, and with a sigh of relief we would continue our walk along the path.
Our investigation or close inspection of the seeming snake would begin only after we have begun to suspect that it may actually not be a snake but only something else, such as a rope, so once this suspicion has arisen, we would stop insisting to ourself that it is a snake that we are looking at, but would instead consider it to be a seeming snake and perhaps a rope. This is similar to our position when we begin to investigate ourself, this ego. We investigate ourself or look closely at ourself only because we suspect that we may actually not be the ego that we now seem to be, but may instead be something else altogether. Now that this suspicion has arisen in us, we need not continue insisting to ourself that we are only an ego, but can with an open mind begin investigating ourself in order to find out whether we are this ego or something else.