There is a natural association between being called to discipleship and being commissioned to witness. And there is a progression between the two. The call of Jesus characterises the first; the empowering of the Holy Spirit characterises the second.
And this also sets our relationship to the Holy. We are CALLED by the Holy One, CONSECRATED through His drawing us into His life and His ministry, recipients of God's promises and participating in His purposes; and we are COMMISSIONED as His witnesses, empowered and enabled to proclaim His name and to engage in acts of loving service.
This is the direction that we are to go upon; and holiness is to be the hallmark of this endeavour.