Fundamentally, says Kreeft, an Evangelical is faced with the choice of trading one fullness for another, and that’s the dichotomy that we, as Catholics, must erase.
As an Evangelical Protestant convert to Catholic myself, I’ve been profoundly attracted to the idea of receiving the fullness of Christ in the Catholic Church: being able to receive Christ in the Eucharist, being able to receive more of a more of God’s graces through the sacraments, and reconnecting to the ancient Christian Church.
But, it’s a significant trade-off to leave the Evangelical world and become a Catholic.
To give up an enriching Evangelical community of fellowship, worship, and prayer.
Many parishes are sleepy: their worship music drones on with no one in particular joining in, their priest’s homilies are trite and without thread of a theme, their programming for families (something as basic as Sunday School) is largely absent, and they don’t feel like communities (everyone keeps their coats on and has a foot out the door by the end of Communion).
This is what Kreeft means by trading one fullness for another.
Source: K. Albert Little - The Cordial Catholic on Patheos, 26 April 2016, "The Catholic Church Must Become More Protestant", http://www.patheos.com/blogs/albertlittle/the-catholic-church-must-become-more-protestant/