The commonly heard.. the frequently recited.. but rarely understood Sloka-

Twameva Mata ca Pita Twameva

Twameva Bandu ca Sakha Twameva

Twameva Vidhya Dravinam Twameva

Twameva sarvam mam devadeva

Its REAL meaning is described beautifully in this Video.

While travelling through births and births, one species after another, we fail to understand our relation ONLY with the Lord.. and thus consider anyone except Lord as our Parents, Friend etc.

SRI GURUDEVA elaborately explains

that Lord Sri Krsna is our ONLY Father, Mother, Best Friend, Well Wisher.. and till we understand this Truth, we will continue to suffer in the cycle of birth and death.