Pope Benedict XVI
“Charity, furthermore, cannot be used as a means of engaging in what is nowadays considered proselytism. Love is free; it is not practiced as a way of achieving other ends. But this does not mean that charitable activity must somehow leave God and Christ aside. For it is always concerned with the whole man. Often the deepest cause of suffering is the very absence of God. Those who practice charity in the Church’s name will never seek to impose the Church’s faith upon others. They realize that a pure and generous love is the best witness to the God in whom we believe and by whom we are driven to love. A Christian knows when it is time to speak of God and when it is better to say nothing and let love alone speak.”
Source: Pope Benedict XVI, God is Love: Deus Caritas Est, Ignatius Press, 2006.