Imagine a sponge in a bathtub filled with water. The sponge is in the water, and the water is in, and all throughout, the sponge as well. Now hear this---you are that sponge. (I mean that in the nicest possible way.) We are immersed in truth at all times---and don't let anyone tell you that is not the case, or that it is more complicated than what I've described.
Gasan referred to meditation, saying that unless we meditate constantly our light of truth may go out. The best sort of meditation is mindfulness, for it is a direct engagement with life itself as it unfolds from moment to moment. Other forms of meditation, usually involving intense concentration of some sort, are more of an escape or retreat from life. No, living mindfully is the way to go.