All these are inspired by one and the same Spirit, who apportions to each one individually as he wills. 1Cor. 12:11
The context of this verse is the giving of gifts by the Holy Spirit to God’s servants so that they may accomplish God’s will. If you want to take a full study on these gifts read our post on The Gifts.
Will, is the ability to think, with the purpose of planning or deciding on a course of action — ‘to purpose, to plan, to intend.’ It is our job to find out what those plans and purposes are so that we can use the gifts He willed to us to do His will.