Our life gets as complicated as a comedy as it goes on, but the complications get gradually resolved: see that the curtain comes down on a good denouement.

[Vase empeñando nuestra vida como en comedia, al fin viene a desenredarse. Atención, pues, al acabar bien.]

Baltasar Gracián y Morales (1601-1658) Spanish Jesuit priest, writer, philosopher

The Art of Worldly Wisdom [Oráculo Manual y Arte de Prudencia], § 211 (1647) [tr. Jacobs (1892)]
    (Source)

(Source (Spanish)). Alternate translations:

Our life is acted like a Play. The Catastrophy is in the last Act. The chief part then is, to end it well.
[Flesher ed. (1685)]

Our life becomes more complicated as we go along, like a comedy, but toward the end it becomes simpler; keep in mind, therefore, the happy ending.
[tr. Fischer (1937)]

Our lives fold and unfold like theater, so be careful to end well.
[tr. Maurer (1992)]