To become ‘one-self’ in terms of individuation of the psyche for Jung
To become ‘one with Self’ in terms of joining with Atman for Wilber
To become ‘one-for-self’ in terms of resolution of existential anxiety for Satre
To become ‘one’s own self’ in terms of resolving regression issues for Freud
To become ‘one-Absolute’ in terms of finding Spirit in the whole for Hegel

for man, woman, men, women, mankind and humanity as a whole.