Visions - 願景 - Yuànjǐng
Sight cannot discern reality
from induced visions,
through natural channels
as well as artificial causeways.
Look with the mind's eye,
split all visions from perception-
~inspired by Deng Ming-Dao
Tao is not to be found through drugs, or external means of altering one's psyche. While you most assuredly will have visions, how do you know what they mean? No matter how vivid they appear or how profound the indications, these visions must be understood if they are to prove useful. By contrast, meditation bestows vision, voices, feelings, as well as absolute certainties. Prior philosophical interest is required preparation to ready one's self for these experiences. By doing this, the individual can fit new experiences together with the old, forming a frame of reference. Confusion is obliterated, and one can finally begin to distinguish truth from falsity. After all, even the perceptions of meditation may leave room for doubt.
Not everything one receives through spiritual inquiry is entirely true. Some are deceptions (self-generated or misunderstandings) and one must be on guard for these, to see through them. The form that these visions take is a function of your mental training and sophistication. They will fall within the natural dimensions of your mind. If you want to receive the impulse of Tao, you should know that it does not come from visions. Receiving Tao is a matter of consciousness. Followers of Tao may indulge in spiritual visions, from time to time, but they know that there is more to learn from the exploration of this world. This allows for the eventual object of spiritual growth - to transcend enslavement to present perceptions and reach a higher state, where we can finally judge reality adequately.