Can the Saints HEAR our prayers? (A Biblical Answer)

There are many ways, using Scripture, to explain that Saints CAN and DO hear our prayers. 

In ʻBiblical Evidence for the Communion of Saints  (2012) ʻ, there are some strong examples.

"Intercession of the saints is indicated in Revelation 5:8 (cf. 8:3–4), 6:9–10, and also somewhat suggested by the appearance of long-dead figures on the earth once again (1 Sam 28:12–15; Matt 17:1–3; 27:50–53; Rev 11:3). The saints are alive, they observe us (“cloud of witnesses”: Heb 12:1), pray for us (Rev 6:9–10), and hence it follows logically that they can hear our intercessory requests, as can guardian angels (Matt 18:10)."

Another powerful scriptural example is in Luke 16: 19-30 where Jesus discusses the example of the rich man in Hades calling on Abraham \ AND Abraham hears him! 

"19 There was a certain rich man who was clothed in purple and fine linen and feasted sumptuously every day. 20 And there was a certain beggar, named Lazarus, who lay at his gate, full of sores, 21 Desiring to be filled with the crumbs that fell from the rich man’s table. And no one did give him: moreover the dogs came and licked his sores. 22 And it came to pass that the beggar died and was carried by the angels into Abraham’s bosom. And the rich man also died: and he was buried in hell. 23 And lifting up his eyes when he was in torments, he saw Abraham afar off and Lazarus in his bosom: 24 And he cried and said: Father Abraham, have mercy on me and send Lazarus, that he may dip the tip of his finger in water to cool my tongue: for I am tormented in this flame. 25 And Abraham said to him: Son, remember that thou didst receive good things in thy lifetime, and likewise Lazarus evil things: but now he is comforted and thou art tormented. 26 And besides all this, between us and you, there is fixed a great chaos: so that they who would pass from hence to you cannot, nor from thence come hither. 27 And he said: Then, father, I beseech thee that thou wouldst send him to my father’s house, for I have five brethren, 28 That he may testify unto them, lest they also come into this place of torments. 29 And Abraham said to him: They have Moses and the prophets. Let them hear them. 30 But he said: No, father Abraham: but if one went to them from the dead, they will do penance. 
31 And he said to him: If they hear not Moses and the prophets, neither will they believe, if one rise again from the dead. " (Douay-Rheims)

Scripture CLEARLY shows an example of the humanly dead (Abraham) HEARING the call of another. AND Before such an argument is written off as ʻjust being an illustrative parableʻ it might be good to point out that Fathers of Church, including St. Ambrose of Milan and St. Thomas Aquinas, believed that this was a REAL event (Ambrose in: De excessu fratris 2.39; De offic. 3.22.136)(Aquinas in: STh., Supplementum q.98 a.4)

image from the 'Public domain' via wikimedia commons.  Crowning of the Madonna and Saints by Lorenzo Costa. 1501