This quote of Sri Ramana's, means that the conscious mind aka our intellect, must stop rising in one thought after another, to settle down into the present moment-ness of the subconscious which is often referred to in metaphysical circles as the heart, due to containing the emotional body that is felt more than thought. When the two minds are working together as one with no discrepancy between them, they are a force to be reckoned with. This single-minded focus of one's attention when paired with the emotional peace of Awareness, allows everything to be seen clearly and reacted to lovingly. Most importantly, this mind state is the perfect channel for intuition aka holy ghost. The I of the conscious mind must marry the Am of the subconscious, so that we become a whole and pure channel for our higher eternal Self - our true and full I Am, to act upon.
~ Tracy Pierce