For it pleased the Father that in Him all the fullness should dwell… – Colossians 1:19

While the expression “dwell” indicates perpetuity, does not it indicate constancy and accessibility? A man who dwells in a house is always to be found there, it is his home. The text seems to me to say that this fullness of grace is always to be found in Christ, ever abiding in Him. Knock at this door by prayer, and you shall find it at home. If a sinner anywhere is saying, “God be merciful to me!” mercy has not gone out on travel, it dwells in Christ both night and day; it is there now at this moment. There is life in a look at the crucified One, not at certain canonical hours, but at any hour, in any place, by any man who looks. “From the end of the earth will I cry unto Thee, when my heart is overwhelmed,” and my prayer shall not be rejected. There is fullness of mercy in Christ to be had at any time, at any season, from any place. It pleased the Father that all fullness should permanently abide in Him as in a house whose door is never shut.

Above all, we see here immutability. All fullness dwells in Christ-that is to say, it is never exhausted nor diminished. On the last day wherein this world shall stand before it is given up to be devoured with fervent heat, there shall be found as much fullness in Christ as in the hour when the first sinner looked unto Him and was lightened…Till time shall be no more He will exercise the same infinite power to forgive, to renew, to deliver, to sanctify, to perfectly save souls. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0978.cfm