校訓
本校校訓為聖經哥林多前書13章7節：「凡事包容，凡事相信」，亦是學校名稱「宏信書院」的由來。
「宏」
宏大、遼闊也。意指人有廣闊的胸襟，能互尊其所以異。除了人際關係外，個人的才學、知識、涵養也要博大、敦厚。廣義來說，人要有國際的視野，方能超越地域、文化、閱歷的限制，對不同的學問都兼收並蓄。人必須謙卑，認識在無垠的宇宙中，個人的渺小，只有信靠神，才能衝破藩籬，尋求真理。
「信」
信心也。意指從深心處對神的信心，雖非眼能見，但滿有盼望、確據，把將會出現的美好結果先植根在心裡。信心必須建基於真理上，認識真理才能提升信心。廣義來說，在時間的洪流裡，人總要經歷起跌，但在這些不穩定、未知之中，深信主宰萬物的神可掌管過去、現在與未來，因此願意忍受短暫的苦楚，好讓將來得到極重無比而永恆的榮耀。
「宏信」
凡事相信－「信」
校園一覽
校歌
宏信念
詞：王仲傑
共你同行共對
靠著我主每段不朽金句
每一句 在我心
信念伴隨
在每場成敗裡
我學會起跌跟失去
是祢 的應許 不減退
誰人在我旁
昂然踏步共領航
宏願在我心 用信心去奔往
世界太廣闊
延共融的曙光
攜著我手 大愛已綻放
前路定能共創
高高低低不變改 是我相信神
細聽祢的真理禱告
誠實地聽祢指引
多堅固 堅守我的責任
宏大志願 信念放在心 我認真 仰望神
訓輔組
宏信書院相信，只有透過全面的體制，方能讓學生於個人、情感、社會及精神都得到均衡發展。為此，我們成立由老師及專家組成的委員會，就宗教及價值觀教育、紀律及輔導各方面為學生制訂一套完善的計劃。另外，我們亦建立了校本學生支援網絡，聯合班主任、家長、社工和教會牧師的共同努力，設計一系列針對學生發展及輔導的計劃。
尊重他人
具責任心
適時而作
為培養學生的精神發展，我們訂立了3R政策（RESPECT尊重他人、RESPONSIBILITY 具責任心、RELEVANCE適時而作）。於日常校園生活中，我們經常稱讚學生、給予肯定，更會於壁報版上張貼表揚訊息、出色作品剪報及好人好事，以營造互相欣賞、鼓勵的良好氣氛。
四社制度
宏信書院的四社為Riesling、Merlot、Shiraz及Chardonnay。小學及中學部的所有學生均會獲分配至各社。
宏信書院的四社制度著重於參與比賽和獎勵學生在課堂上的良好表現，為他們提供機會以發展技能、建立體育精神、培育適當行為和領略公平競爭的精神。此制度旨在透過多樣化的運動及學術活動，以贏取四社盃為目標，營造良性競爭環境，從而使學生以屬社為傲，並培養歸屬感。
四社的名稱為不同種類的葡萄，分別代表不同的特質。
The dragon has been chosen to represent Riesling because dragons embody aspiration, bravery, loyalty, curiosity, and risk taking. This fantastical and mythical beast is not just an attractive and fascinating creature, it is also tough and resilient. The poppy has been chosen as it represents success and imagination, which are central to the spirit of Riesling. The dragon creates a tough and strong image that matches the spirit of the house even more.
The unicorn has been chosen for Merlot because it represents freedom, purity, mercy and beauty. It also encompasses the idea of innocence. The iris has been chosen as the flower to represent Merlot, because it is the symbol of wisdom, hope, faith and friendship.
The tiger has been chosen for Shiraz because it is an independent, fearless, and mysterious animal. It is also known for being elegant, unique, as well as showing great strength. The rose has been chosen to represent Shiraz, not because it represents romance, but because it symbolises elegance, grace and respect. The leaves of roses are also meaningful as they represent hope. The design is meant to be neither too soft nor too tough, which is why the tiger and rose combination was chosen.
The deer or stag was chosen to represent Chardonnay because it stands for leadership, determination, calm and nature. It also symbolises elegance and beauty. The flower chosen for Chardonnay is nasturtium, because it symbolises victory and conquest.
Riesling
(黃)
Taking pleasure in solitude
While displaying your unparalleled delectable manner
You fascinate us with fragrant style
Toppling the anticipation with aspiring glamour
Steadfast in your long journey
With a poignant resourceful edge. Though much obliged to those surrounding
Brisk grey skies you readily thread
Merlot
(紅)
And a blooming pace quickened to an early entrance
The innocence you hold is soft and lavish
Within preserving a subtle essence
Fondness and admiration found in the rims of friendship
For your fellowship compliments the bitterness of your acquaintance
Enclosing sweet affectionate charms
Contributing to all with care and brilliance
Shiraz
(紫)
Marveling in a stoic disposition of strength
And rivered for the exertion you endure
Throughout balancing the weaknesses of companions
A Powerful and abundant spirit increases your allure
Enjoy the warmth of natures course
In the late hour you find yourself
Distinguished and classic you are within
Thriving the exotic personas with vigorous depth
Chardonnay
(綠)
There are moments where flamboyance isn’t just
Elaborate measures & extensive chimes doesn’t do
This is when you shine brighter than all
Extending your calming sovereignty as we bow to you
Notable recognition given
While flourishing in many lands
We replicate your obscure form with honor
Sheltering your qualities in the midst of our hands