Emunah (eh-moo-na): A knowing, deep in the soul, that there is only one G‑d, that He is good, and that He loves you unconditionally.
Simchah (sim-kha): A mighty current of life-energy felt when contemplating emunah.
Bitachon (bi-ta-khon): A surge of invincible confidence that emerges when emunah is challenged by circumstance.

Through the Torah, the Zohar and the sages as Abraham, Moses, the Ari. Rabi Schneur Zalman of Liadi and others we know from G_d's thought of Creation that He has a goal and positive destiny for humanity.
Within our narrow frame of reference, the process may be turbulent and chaotic filled with heartbreaking lows and few exuberant highs as we experience many states to refine our nature.
Faith above our limited reasoning enables us to accept the process which leads to one harmonious interconnected union between us and G_d.
We can only accelerate the process by gripping onto bitachon and following the instructions from the holy books and sages.