Changes

Concentration in the heart is best aided if possible by the power and light descending from above the head. <ref>http://incarnateword.in/cwsa/29/concentration-and-meditation#p58</ref>

Concentration in the heart is not meditation, it is a call on the Divine, on the Beloved. <ref>http://incarnateword.in/cwsa/29/combining-work-meditation-and-bhakti#p43</ref>

When we speak of concentrating in the heart in Yoga, we are speaking of the emotional centre and that like all the others is in the middle of the body in a line corresponding to the spinal cord. <ref>http://incarnateword.in/cwsa/30/descent-and-other-kinds-of-experience#p20 </ref>