Patanjali's yoga sutras

शान्तोदिताव्यपदेश्यधर्मानुपाती धर्मी॥१४॥

3.14 śān-odita-avyapadeśya-dharmānupātī dharmī

shaanta = past, subsided

udita = arisen, present

avyapadeshya = future, not yet mentioned

dharma = essential nature

anupaati = follows, goes through

dharmi = the one who possesses the essential nature

From past to present to future the one thing that follows you is that you are the one who possesses the essential nature.