Isaiah 66:4

I also will choose their delusions, and will bring their fears upon them; because when I called, none did answer; when I spake, they did not hear: but they did evil before mine eyes, and chose that in which I delighted not.

Note closely in this verse that God did not create their delusion, only used it to serve a purpose.

2 Thessalonians 2:11

And for this cause God shall send them strong delusion, that they should believe a lie:

In this case God sends a strong delusion. God has just cause to do that.

2 Thessalonians 2:9-10 English Standard Version

⁹ The coming of the lawless one is by the activity of Satan with all power and false signs and wonders, ¹⁰ and with all wicked deception for those who are perishing, because they refused to love the truth and so be saved.

In Isaiah 66:4 it was His children Israel. In 2 Thessalonians 2:11 it is people who have denied Christ.

If you have accepted Christ by faith you need not worry about being delusional.

Isaiah 55:11

so shall my word be that goes out from my mouth; it shall not return to me empty, but it shall accomplish that which I purpose, and shall succeed in the thing for which I sent it.

Psalm 19:7

The law of the Lord is perfect, reviving the soul; the testimony of the Lord is sure, making wise the simple;

Hebrews 4:12

For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart.

How can the Word of the Lord do the will of God the Father if we do not remain in the Word?

Luke 8:15

As for that in the good soil, they are those who, hearing the word, hold it fast in an honest and good heart, and bear fruit with patience.

Colossians 3:16

Let the word of Christ dwell in you richly, teaching and admonishing one another in all wisdom, singing psalms and hymns and spiritual songs, with thankfulness in your hearts to God.

The fruit of patience is thankfulness to God in a heart that has grown closer to Him.