I John 5:14 Now this is the confidence that we have in Him, that if we ask anything according to His will, He hears us.
15 And if we know that He hears us, whatever we ask, we know that we have the petitions that we have asked of Him.
For us to be able to ask anything according to His will, we must be able to know His will. Where do we find His will? We find His will in His word through the revelation of the Holy Spirit. Our confidence in faith grows when we know His will. Is it God's will for us to know His Will? There are many verses that say so like this one:
Col 1:9 For this reason we also, since the day we heard it, do not cease to pray for you, and to ask that you may be filled with the knowledge of His will in all wisdom and spiritual understanding;