Sri-bhagavan uvaca
Samam kaya-siro-grivam
dharayann acalam sthirah
sampreksya nasikagram svam
disas canavalokayan
prasantatma vigata-bhir
brahmacari-vrate sthitah
manah samyamya mac-citto
yukta asita mat-parah
Meaning: One should hold one’s body, neck and head erect in a straight line and stare steadily at the tip of the nose. Thus, with an unagitated, subdued mind, devoid of fear, completely free from sex life, one should mediate upon Me within the heart and make Me the ultimate goal of life.
Bhagavad Gita: Mediate upon Me within the heart and make Me the ultimate goal of life. (Dhyana-yoga (Text 13,14, Ch 6))