When one finds the truth they must first look through the dark in order to find the substance.
To be able to see through the dark, one must keep the heart aspect balanced in intentions of mind and being.
The heart remains true to the original cause, throughout the experience of the dark, by simply feeling.
By remaining in that sense of feeling, we are guided by intuition, rather than the external projects of sense which are useless in the dark.
The heart connects to meaning, through feeling and intuition, and so when we do not have the appropriate physically measurable coordinates we can look within and this guides us towards the destination.