"Hold on tightly, let go lightly"

Mens sana in corpore sano

A healthy mind in a healthy body

Νοῦς ὑγιὴς ἐν σώματι ὑγιεῖ

"...the enemy  is not always outside..."

" Resist what resists in you "

Krishna´s  advice in the Mahabharata

The Self and the Ego ...it is not the same.