NEVER
John 16:13 NKJV “However, when He, the Spirit of truth, has come, He will guide you into all truth; for He will not speak on His own authority, but whatever He hears He will speak; and He will tell you things to come.”
As a Christ-Follower you NEVER have to be caught off guard. You have the primary agent of the Trinity, the Holy Spirit living inside of you. He will guide you into Truth, His mission is to Glorify Jesus and help you to do the same.
Get to know Him and Ask for His help everyday and you will NEVER lack His guidance and wisdom.