The Gemarrah (Brochos 6b) writes that one who rejoices before the chassan at his wedding is considered to have brought a thanksgiving offering. What connection is there between these two?We find that the thanksgiving offering is composed of two opposite ingredients. It has the unique distinction of being the only sacrifice made up of both chameitz and matzoh. These diametrical ingredients symbolize the union of man and his creator. Man is finite, imperfect, mortal but is given the opportunity to attach himself to Hashem. Hashem allows man to obtain spirituality when they cling to him. He established a place for His servants to reach out to Him. For this alone, man owes Hashem much thanks. In fact the thanksgiving offering is the only sacrifice that will remain in Messianic times. There is no better way to thank Hashem than through a sacrifice that teaches how all elements of the world belong to Hashem and despite their polar opposites they find harmony through Him.
In marriage one sees a similar incompatibility. Like chometz and matzah, men and women are dissimilar, even opposites in many respects. They differ in their thinking, their emotions in their reactions with others. They are so opposite that it may seem inconceivable that they could join their lives together. But the Talmud teaches that just as chometz and matzoh converge to form an offering to Hashem, so too can man and woman merge their distinct natures to become husband and wife, as long as Hashem remains the constant focus of their relationship. This concept is highlighted in the Holy of Holies. The place where Hashem communicates with man is in between the male and female Cheruvim. Hashem resides in the place where opposites merge in harmony. Heaven is referred to as Shomayim in Hebrew which is a combination of opposites Aish u'Mayim-fire and water. This is what the thanksgiving offering represents.