In context, Jesus was specifically saying that to His apostles (therefore, we see it happen just that way in their lives... but rarely in ours); however, it applies to us secondarily if we are in Christ. I've talked to many Christians who don't know how to hear from God and so speak what He is saying. Jesus said that when 'we' stand before others to be judged or on trial, He will give us what to say. We rarely find this happen today; we tend to regurgitate what the Bible says and what we're taught in church when 'witnessing' or 'defending God or the Bible' but rarely know how to hear Him when He is giving us those words He gave primarily to His apostles and then to us (if we listen). The apostles were a listening people; we tend to not be.
Another passage (and there are many) which has been taken out of context is 1Jn. 4:18 which says, "There is no fear in Love, but perfect Love casts out fear because fear has to do with torment. The one who fears has not been made perfect in Love." Some say it means that if you only know how much God loves you, you won't fear. Overall true (apparently, most have no idea as fear rules so many). Others say that if we just love God enough, then we will have no fear. Also overall true (though, again, apparently many don't love God much as many live in fear). But what is the passage saying in context (primarily)? It's primarily about our love for others when empowered by His Love within us (see 1Jn. 3:16-18 for another way John says this). Here's the whole passage to unfold more easily what it is saying in context:
"We know and rely on the love God has for us. God is Love. Whoever lives in Love lives in God, and God in them. This is how Love is made complete among us so that we will have confidence on the day of judgment: in this world we are like Jesus.There is no fear in Love. But perfect Love drives out fear, because fear has to do with punishment. The one who fears is not made perfect in Love" (vv. 16-18, NIV; underlined segment sums it all up).
1Jn. 4:18 in context is primarily and firstly saying that if we love others with God's Love (selfless, genuine, from God directly and not from our soul or of sentiment or good intentions), then without a doubt, we have nothing to fear when we stand before Him at the judgment 'in that Day'. John reasons that this must be so, because God doesn't condemn Himself and so cannot condemn one who dwells (lives) in Love and shares that Love out to others: "in this world, we are like Jesus" if we love with God's Love... and Jesus doesn't condemn Himself and so won't condemn us... therefore we have full assurance of safety or eternal Life and so have no fear of judgment. People who commit crimes of any type (in the home or on the streets; people who know they are in the wrong) are naturally not anxious to stand before any type of judge (cops, judge, neighbors, coworkers, anyone who knows whatever wrong way they live); but people who live right have confidence that they have nothing to fear. This is what it means by saying the one who fears is not made perfect in Love; he is afraid because at least inside him, he knows he has not loved others as he himself wants to be loved. Loving people like this isn't an absolute requirement to be safe from judgment; however, people who love this way know without a doubt that they are safe from judgment. That passage says more than this, as all the words in the Bible are alive and able to 'change', but this is what it is primarily saying. Now, that passage will finally make perfect sense when you go back and read it in this context.