Crucial principle for life and ministry: the more Scriptural something (a belief, a practice, a method or way of doing ministry) is, the more spiritual and God-pleasing it is. (And the reverse is therefore true too.)
Elaboration: If something is Scriptural it is spiritual and God-pleasing (because 'Scriptural' = defined by God Himself through His Word). If it is unscriptural it is unspiritual and dis-pleasing to God.
The more Scriptural something is the more spiritual and pleasing to God it is.
The more unscriptural something is the more unspiritual and displeasing to God it is. I'm not saying 'more strict' I'm saying more Scriptural. (The Pharisees were stricter than Jesus, but not more spiritual and God-pleasing.)
Paul says he prays that the Colossian believers will be filled with the knowledge of God's will or purpose (Col. 1:9ff.). Well, that knowledge comes through God's inscripturated word.
So if we really want to live a God-pleasing life and carry out God-pleasing ministry, we will live a life, and do ministry, shaped by the fullness of the knowledge of God's will and the knowledge of God himself -- realizing that comes through God's word and that God’s Word is available to us through Scripture.
And what is the Biblical basis for all this? ...the fact that God gave us the Bible.