What is the Scriptural basis for Catholics praying to Mary and the various saints?

While researching for [this answer](https://christianity.stackexchange.com/questions/32544/how-does-the-bible-teach-us-to-direct-our-prayers/32588#32588) , I came across [this quesion](http://www.gotquestions.org/pray-Father-Son-Spirit.html) . In its answer it stated: > Roman Catholics are taught to pray to Mary and various saints. Such > prayers are not scriptural and are, in fact, an insult to our heavenly > Father. The question is, what is the Scriptural basis for Catholics praying to Mary and the various saints? Please note that [What is the basis for the solicitation of prayers from dead saints?](https://christianity.stackexchange.com/questions/767/what-is-the-basis-for-the-solicitation-of-prayers-from-dead-saints) is seeking **'how'** these prayers originated - and categorically states *'it does not intend to get answers why these prayers are acceptable'* - while this question is seeking the scriptural basis of these prayers, i.e. **'why'** are they acceptable from scripture? Please note that the acceptable answer will be one that does not just rattle off scriptural verses, but also demonstrates an understanding of the Catholic practice in light of scripture. The answer should also address: *'Roman Catholics are taught to pray **to** Mary and various saints.'*