The manager believes the Chelsea-owned striker is not motivated by money and feels the Toffees have offered him an "incredible opportunity."
The Chelsea-owned forward has scored 13 goals in 25 Premier League appearances this season as the Toffees prepare to challenge Arsenal for fourth spot with six games remaining.
"He's a grounded and intelligent young man, who is not going to be swayed by the materialistic aspect of the game," the Everton manager told reporters. "What can we offer him? Just enjoying his football. As a player, happiness is something that is very important. When you can offer football happiness it's an incredible opportunity."