Once you have seen your reflection, work hard. With diligent practice, you may eventually enter samadhi or see your self-nature. The harder you practice, the deeper you will penetrate your mind. You will be able to distinguish different levels of experience, just as you can now differentiate between seeing water, drinking water, jumping into water, and becoming water.

If you work hard, you may reach a point where you do not see or hear anything, but it is not necessarily samadhi. Your concentration may be strong enough to have shifted the mind from the eyes and ears, but wandering thoughts may still be in the mind. Initially, you will not know which level of samadhi you have reached, but as you enter deeper levels of samadhi, you will become clearly aware of your mental state. If you cultivate samadhi and deepen your levels of absorption, you can give yourself a "suggestion" to come out of samadhi after a certain period of time. For instance, if you tell yourself to come out of samadhi after three days, you will return from samadhi at that time. Otherwise, you will have to wait until the power of samadhi subsides. However, an external stimulus, such as a ringing bell, might be able to bring you out of samadhi.

Attaching to emptiness, denying cause and effect,
Brings calamities beyond measure.
Rejecting existence and grasping emptiness is the same mistake,
Like jumping into a fire to avoid drowning.