Remember, however, before all else, to strip things of all that disturbs and confuses, and to see what each is at bottom; you will then comprehend that they contain nothing fearful except the actual fear.
Seneca(Letters from a Stoic - Letter XXIV: On Despising Death)
Everyone hurries his life on and suffers from a yearning for the future and a weariness of the present. But he who bestows all of his time on his own needs, who plans out every day as if it were his last, neither longs for nor fears the morrow.
Many of the anxieties that harass you are superfluous: being but creatures of your own fancy, you can rid yourself of them and expand into an ampler region, letting your thought sweep over the entire universe, contemplating the illimitable tracts of eternity, marking the swiftness of change in each created thing, and contrasting the brief span between birth and dissolution with the endless aeons that precede the one and the infinity that follows the other.
The stoic philosophers of the ancient world were wise individuals, that is for sure. They mostly strived after virtue and detachment from no-good passions. The stoics also had a vision of a ideal sage which transcended the usual limitations that people had. The Stoic Sage was constantly in a state of tranquility and contentment with whatever life presented unto him. For some stoics the sage was just an ideal target to aim against and not a concrete reality to be realized.