“And God gave Solomon wisdom and exceedingly great understanding, and largeness of heart like the sand on the seashore,” (1st Kings 4.29).
Apparently Solomon’s “heart” was the totality of his inner nature. It described “virtually every immaterial function” of the man whom we have come to know as the wisest of all men (1st Kings 4.31). Solomon’s emotions, intellect, will, conscience, character, and personality; his 'who-I-am-ness,' were all wrapped up in this concept called “heart.”
Everybody has an inner person, but Solomon was unique. His inner person was really, REALLY BIG. God gave him “largeness of heart like the sand on the seashore.”