There's no 'if' to it...It IS in the scriptures,
Whatta ya think??? God figures all Christians should line up at the welfare office???
[if] “salvation is the ultimate goal (which it is), Everything we need to know about salvation and our daily walk with Christ is in the Scriptures...
I reject the premise. Salvation has never been the ultimate goal or else ALL would be saved.
The ultimate goal is for God to reveal His Glory. (Ps 113:4-6)
The Lord is high above all nations,
His glory above the heavens.
Who is like the Lord our God,
Who dwells on high,
Who humbles Himself to behold
The things that are in the heavens and in the earth?
Given the last statement, we find that salvation is all but a small part of how God's manifests His glory. He delights in lifting up the poor and needy out of the dust and ash heaps and seating them among the princes. He turns the hearts of kings, forms and channels the rivers, defines the boundaries, calls His people to Himself. Therefore there is Glory in the works of Righteousness that come from our daily activities.
To limit the "Why" to just "salvation" is to be a Deist, not a friend of God.