All meditation should be carried out by sitting cross-legged?
Outside formality cannot always reveal something inside. Some practitioners brag about his/her ability of sitting full lotus posture in long time, showing offer their accomplishment in the course. But, the attainment inside matters the most in terms of the advancement. Towards such case, some masters liken it to the effect of “using bamboo basket to spoon moon in the water surface.” In format, it is close to the concept of meditation but in fact, it distances from the true value very far away!