[Skull]

Immortality is possible, but only with conditions fulfilled.

No noble thought, no grand aspiration, desire, or divine immortal love,
can come into the brain of the man of clay and settle there, except
as a direct emanation from the higher to, and through, the lower
Ego; all the rest, intellectual as it may seem, proceeds from the
‘shadow,’ the lower mind, in its association and commingling with
Kāma, [passions] and passes away and disappears for ever. But the
mental and spiritual ideations of the personal ‘I’ return to it, as parts of
the Ego’s essence, and can never fade out. Thus of the personality
that was, only its spiritual experiences, the memory of all that
is good and noble, with the consciousness of its ‘I,’ blended with
that of all the other personal ‘I’s’ that preceded it, [in previous lifetimes]
survive and become immortal.

Blavatsky