If you’re not willing to preach in the basement, you have no business preaching in the bay window. The trick is improving your preaching talent and skills without simultaneously attempting to carve out your own niche in the Preaching Hall of Fame.
God has a purpose for everything He does and though He certainly is not obligated to explain Himself to any of us, He does typically reveal His motives through Scripture.
When discussing Romans 8:29 Calvinist’s will typically argue that a personal intimacy is in view.
Calvinism teaches that God foreknows because He decreed that man would act a certain way, and thus man necessarily acts a certain way and God can be certain of that.
To declare God’s glory is to talk about His greatness. God is great, and He is more than worthy of all praise and glory.