The Rebbe's teaching that everything in a person's life is guided by G-d — and what that means in practice:
Every detail is guided from Above. The Baal Shem Tov taught that Divine Providence extends to every detail of creation, even inanimate things (IK 094, 405, 9237). It applies equally to every person, whatever his standing (IK 3532), and is a fundamental of Judaism (IK 3723). It works within nature, not only through open miracles (IK 432, 10751). Our generation has been given a special ability to see it clearly (IK 7522).
Learn to see it. Even ordinary daily events reveal G-d's guidance (IK 7087, 7277). Every meeting and encounter — even with fellow travelers on a journey — is arranged for a purpose (IK 1007, 7987). Keep this awareness engraved within, even when you aren't consciously thinking of it (IK 5038).
Where you are placed is your mission. Setbacks like a visa refusal may be keeping you where you are needed (IK 1445). A move, even to a senior home, is arranged from Above and brings new opportunities to spread Torah (IK 1280, 3982). Knowing that G-d is with you everywhere dispels loneliness (IK 5740). When a clear opportunity such as a permanent job is offered, take it as a sign and go ahead with confidence (IK 6679).
It is for the good, even when we don't understand. Hardships serve purposes beyond our understanding (IK 4444, 9167), and trusting that everything from Above is ultimately good brings that good into the open (IK 6543, 10006). After a loss, an even greater Divine mercy is aroused (IK 1403), and true comfort comes from Above (IK 9685).
Providence and our own choices. G-d's knowledge doesn't cancel free will; both are true (IK 2832, 6741, 9591). Everything comes from Heaven, yet we must take initiative and seek good advice (IK 10466), combine trust with natural effort (IK 8473, 9274), and pray (IK 264).
What it changes. Seeing G-d's hand in everything removes despair and resentment toward others (IK 10139) and grudges (IK 4919), leaves no room for negative thoughts (IK 2613), and brings joy and strength in hard times (IK 5679, 8711). Recognizing His kindness should move us to add in Torah and mitzvos (IK 1446).
See also: Bitachon – Worry, fear and anxiety.