The Rebbe's guidance on how to bring another Jew closer to Torah and mitzvos:
Every Jew can be reached. Every Jew has an inner spark of holiness that can be awakened (IK 3236); no Jew or community is ever a "desert" — each holds hidden treasures (IK 3196). Never give up on another Jew, however distant (IK 6158), and reach even the most distant (IK 316). Saving even one soul spiritually is like sustaining a whole world (IK 2755). Use every opportunity, even speaking at non-religious gatherings (IK 938).
Pleasantly and gently. A gentle, pleasant approach achieves far more than harshness (IK 4611, 2709, 6612). Gentle encouragement inspires lasting commitment where pressure does not (IK 3093, 1293). Encourage growth gradually, one practical mitzvah at a time (IK 1591), and be sensitive to each person's character (IK 5330). Begin with children and act out of love; gradual change will succeed (IK 2930). Make gatherings welcoming to newcomers (IK 3280). When someone feels embarrassed before you, that is an opening to reach out (IK 2407). Quiet encouragement can have great impact (IK 5390), and patience is essential (IK 5171, 6061).
But without compromise. True outreach upholds Torah standards without compromise, while explaining them warmly (IK 3812, 3973, 4729). Spread traditional Judaism as it is, in the spirit of the Baal Shem Tov (IK 8573, 8609, 9595), and state the truth clearly when it is being distorted (IK 2798, 3588). Pleasantness and firmness go together (IK 3564, 4675).
Personal example. The most powerful influence is personal example together with heartfelt words (IK 1345, 3420, 7758, 8655, 8907), and spreading Chabad ways is best done by example rather than confrontation (IK 7036). Sincere effort and personal example bring results even with family members (IK 10387). Reach women in appropriate ways, with sincerity and a positive emphasis (IK 2604).
See also: Jewish outreach – Opposition, setbacks and not seeing results; Parenting – When a child drifts from Judaism.