Negative Mitzvah 340: Prohibition against marriage with one's father's sister
Leviticus 18:12 "Do not act immodestly with your father's sister"

It is forbidden to take your father's sister (your aunt on your father's side) as a wife.

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Negative Mitzvah 341: Prohibition against marriage with one's mother's sister
Leviticus 18:13 "Do not act immodestly with your mother's sister"

It is forbidden to take your mother's sister (your aunt on your mother's side) as a wife.

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Negative Mitzvah 342: Prohibition against marriage with one's uncle's wife
Leviticus 18:15 "She is your aunt; do not act immodestly with her"

It is forbidden to act immodestly with your uncle's wife (your aunt because she married your uncle).

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Negative Mitzvah 343: Prohibition against marriage with one's daughter-in-law
Leviticus 18:15 "Do not act immodestly with your daughter-in-law"

It is forbidden to act immodestly with your son's wife (who is your daughter-in-law).

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Negative Mitzvah 344: Prohibition against marriage with one's sister-in-law
Leviticus 18:16 Do not act immodestly with your sister-in-law"

It is forbidden to act immodestly with your brother's wife.

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Negative Mitzvah 345: Prohibition against marriage with two sisters
Leviticus 18:18 "Do not marry a woman and then take her sister as a wife"

It is forbidden to take a woman as a wife when you are already married to her sister.

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There was a chassid, R. Binyomin Kletzker, who dealt in timber. Once, he made his accounts for the day and on the bottom line he wrote, "There is nothing else but He [G-d]." When they demanded of him, "What are you doing meditating in the middle of business?" He explained, "If I can think business in the middle of meditating, I can meditate in the middle of business."

From: Bringing Heaven Down to Earth by Tzvi Freeman - tzvif@aol.com