For Spirit communication to be effective in the world of matter, there must be a medium, a nexus, a channel, an instrument through which spirit power can flow to reach someone.
When we speak mentally to our spirit friends, they may not hear us, for it depends whether they are attuned to us. Wherever there us a kinship between souls in two states of life, then all thoughts, all the requests are immediately known.
Channeled information when passed through beings of different levels of evolution, may appear contradictory. This may occur due to:
The level of attainment of the energy essence from the world of spirit.
The vibration attained between medium and energy essence.
The symbolic nature of the information, relative to the spiritual path and evolutionary state of the recipients.