The reality of Christ in us is not just something to bring us comfort, but is also something that is to be a blessing for others. In Ephesians 4:31 for example, Paul encourages us to ‘get rid of all bitterness’. How can we do this?
Bitterness is not a part of the Jesus that dwells within us, it comes from elsewhere. When we find negative emotions rising up, that is the time to find the presence of Jesus within us, and to find the good things that dwell in us because he dwells in us.
It is not about an act of will, but rather finding the one within, and letting him shine through us.