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//Custom pagination text
add_filter( 'genesis_next_link_text', 'modify_next_link_text' );
function modify_next_link_text($text) {
    $text = 'Older posts';
    return $text;
}

add_filter( 'genesis_prev_link_text', 'modify_prev_link_text' );
function modify_prev_link_text($text) {
    $text = 'Newer posts';
    return $text;
}