Abide

"For if we died with Him, we shall also live with Him;
If we endure, we shall also reign with Him;
If we deny Him, He will also deny us;
If we are faithless, He remains faithful;
for He cannot deny Himself.
2 Timothy 2:11-13

When His word says, "if we died with Him," it is talking about dying to ourself. Remember, "the old things passed away, behold new things have come." We live with Jesus by walking with Him. We confess our sins (agree with God that things we have done are wrong) and we repent (we decide we are not only going to confess, but also stop doing this wrong thing.) We follow His commands in His word. And we let the Holy Spirit do it for us. This is walking with Him. We 'abide' in Him. We follow His commandments and pray and read His word. And if we mess up, we confess and repent again. We 'walk' with Him.
And His word mentions 'enduring' a lot. It is to keep walking even when it's really hard and we want to throw in the towel and just give in and stop trying. But God will give us the strength. And He will never leave us or forsake us.