From a philosophical and scriptural standpoint, what is the justification for the practice of offering Dakshina to a Guru?

The practice of giving Dakshina is strongly supported by scripture as a means for spiritual advancement. Chapter 14 cites the Shruti (Vedas), which explicitly states that 'through sacrifice, through giving, through penance,' one can attain self-knowledge, making Dakshina a valid technique. It is beneficial for both those seeking worldly gain and those seeking spiritual liberation. Furthermore, the Taittiriya Upanishad commands that giving should always be done with faith. The text argues that if Dakshina is approved for the worship of gods, it is certainly appropriate in the worship of saints, who help devotees overcome worldly attachments like greed.