Spirandum ante sententiam gnoscite

Egyptian Hieratic Aum

Know the breath before the thought. This is a concept which I think is agreeable to traditional Rosicrucians, the Om often being incorporated into their cosmo-conception.

Let your thoughts explore the object of your meditation, but don't cling to them. Be aware of your thoughts as they surface, then let them go and return to the breath.

This may be at odds with the proceduralism of Egyptian magic and European alchemy, but I think it's at least a good place to start.