Question:
I have three suggestions:

(1) You can give them literature which is written to help new believers (such as the booklet “12 Helps for Young Christians” put out by Moments with the Book, P.O. Box 322, Bedford, PA 15522).
(2) You can invite them to a Bible study.
(3) You can tell them more about the Lord Jesus from your own personal experience in reading and studying the Bible. The Lord has given precious truths to you so you can share them with others. And the best way to keep a spiritual nugget is to give it away, because when we give it to others, it becomes more precious to us.

Answer:
Hebrews 4:12 says, “The Word of God is quick, and powerful, and sharper than any two-edged sword, piercing even to the DIVIDING ASUNDER OF SOUL AND SPIRIT…” This verse tells me two things about the soul and spirit: (1) They are definitely two distinct things; and (2) They are very closely related.

Simply stated, I believe the Scriptures present the SPIRIT as the seat of the “mind” or “understanding.” First Corinthians 2:11 says, “What man knoweth the things of a man, save the SPIRIT OF MAN which is in him.” Thus, the “spirit of man” in the man is that part of him to which all intelligence is referred. It is not an “influence” or “a state of feeling,” but a conscious intelligent existence in the man, and that to which all his intelligence of human things is due. See also Proverbs 14:29 and Isaiah 29:24, and then Proverbs 29:11; Ezekiel 11:5; 20:32; and Daniel 5:20, where the word spirit is translated “mind.”
I believe the Scriptures present the SOUL as the seat of the “affections.” It loves (Genesis 34:8; 1 Samuel 18:1; Psalm 84:2); it hates (Leviticus 26:15; 2 Samuel 5:8; Zechariah 11:8); it has compassion (Judges 11:16; Job 30:25; Ezekiel 24:21); it lusts (Job 23:13; Psalm 10:3).
For anyone desiring to investigate this subject further, I would highly recommend the perusal of Mr. F. W. Grant’s book Facts and Theories as to a Future State, or the abridgement of that book titled: “Man and the Future State.”