Oh completely, being kind and gentle is a sign of strength, great strength. Its so easy to lock yourself away or be rude and wicked, its easy to try to pull the wool over peoples eyes and try to be tacky and talk behind peoples backs. Humans are often petty and pathetic, its takes power of will and strength of knowing who and what you are to stand against those ridiculous torrents of insanity. To actually say NO, I know enough that the things I do matter, that my strength can change things if its misused, that I choose to use my talents and skills for mutual benefit of those around me, that I am a gardener of people and relationships. And I will defend those because I have strength to spare.
I have never had a problem with courage, I was always able to make myself Just DO IT even if I was scared, I analyzed and took risk assessments and I do it... Ive done stupid stupid things in the name of my own curiosity, things that people who display false courage would be too cowardly to do. And thats just EASY stuff like smuggling narcotics or fighting impossible odds to prove a point and risking my life and health to explore the depths of my shadow. To know.
That's just the easy shit, it doesn't take much strength to sacrifice your own body for a thrill... it does take real strength though to care about the people and environment around you, and to live with a purpose, and to be rigid and unflinching in your quest to be a hero, to bring light and comfort to those who need it and shelter those who you meet along the way, to lead by example and to be true to your word, and let your inner soul burn with intensity. Thats where I think much of INFJ type peoples strength comes from.
Its a strength of essence. Anything we apply it to, we excel at. Thats our gift.
Counter balanced of course to those gifts are things like being a little neurotic, thats a price to pay, being quiet and mistrustful of peoples motives, being overly gentle in person so as not to disturb the environment... they lead people to think we are either stupid, or arrogant, that we dont want to talk to them. They see it as weakness... People fear what they dont understand. Luckily, that is none of my concern, I have learned to not care about that. Because when push comes to shove, I will react with anything i need to to come out on top of the situation if it has to come to that.