What does it mean to not have a spirit of fear?

 

For God has not given us a spirit of fear, but of power and of love and of a sound mind. Therefore do not be ashamed of the testimony of our Lord, nor of me His prisoner, but share with me in the sufferings for the gospel according to the power of God... 2 Timothy 1:7‭-‬8

Is being fearful a sin?

Should Christians be fearless?

What is the spirit of fear God hasn't given us?

Resources:

https://96tolife.blogspot.com/search?q=Spirit+of+fear&m=1

https://www.livinggodministries.net/living_god_ministries/radio_archive/audio_files/romans_08_ashamed_of_the_gospel_1_14_16.mp3