Transcendence means going beyond ordinary limits: beyond constant swings of mood, beyond identification with the body and mind, beyond dependence on outer circumstances. It is not an escape from life. It is a shift in where we stand inside it. People often catch glimpses of it in deep calm, selfless service or moments when worries fall away.
The Gita explains this shift through the three gunas. Gita 2.45 asks us to rise above the influence of nature's three qualities and the pairs of opposites, remaining balanced and self-possessed. Gita 14.20 says that by rising above the gunas, the soul is released from the cycle of birth, death, aging and suffering, and enjoys immortality. Gita 8.20 speaks of an eternal reality beyond even the unmanifest source of creation, which remains unchanged, and invites us to anchor security in what is changeless.
It also notes limits and supports. Gita 8.28 says that yogic knowledge goes beyond the results of even virtuous external practices, so do good deeds and study sincerely, but keep your sights on inner transformation. Gita 12.5 says the formless path is real but demanding, so choose a method suited to your present capacity. Gita 7.14 says that maya is hard to overcome through personal effort alone, and that sincere effort together with humility and surrender helps.