What is the Catholic teaching on uniting with Christ's suffering?
Specifically when we go through some kind of suffering and we acknowledge it as God's will and converse it with Christ. It reminds us of His suffering and helps us to realize what Christ did for us.
My question is: Does it also subtract from his suffering? When he went through his passion Jesus saw all sins of past, present, and future. But he also saw the fruit and the saint's responds which gave him comfort. Does uniting to Christ's suffering only comforts the heart of Jesus or also subtract his suffering during crucifixion where he would otherwise have gone through them?
For example: If I suffer some pain and take it as sharing Jesus's suffering, was that sharing now split between me and him and now Christ doesn't need to suffer as much(back in time) because I took some part on myself?
"In bringing about the Redemption through suffering, Christ raised human suffering to the level of the Redemption. Thus each man, in his sufferings, can also become a sharer in the redemptive suffering of Christ" (Salvifici Doloris).