Two principles in human nature reign--
Self-love to urge, and reason to restrain. [ Pope ]

Music's force can tame the furious beast;
Can make the wolf or foaming boar restrain
His rage; the lion drop his crested mane
Attentive to the song. [ Prior ]

Thy spirit within thee hath been so at war.
And thus hath so bestirr'd thee in thy sleep
That beads of sweat have stood upon thy brow
Like bubbles in a late-disturbed stream:
And in thy face strange motions have appear'd,
Such as we see when men restrain their breath
On some great sudden haste. [ William Shakespeare ]

Genius! thou gift of Heaven! thou Light divine!
Amid what dangers art thou doom'd to shine!
Oft will the body's weakness check thy force,
Oft damp thy Vigour, and impede thy course;
And trembling nerves compel thee to restrain
Thy noble efforts, to contend with pain;
Or Want (sad guest!) will in thy presence come,
And breathe around her melancholy gloom:
To Life's low cares will thy proud thought confine,
And make her sufferings, her impatience, thine. [ Crabbe ]

I think the first wisdom is to restrain the tongue. [ Cato ]

These wickets of the soul are placed so high,
Because all sounds do highly move aloft;
And that they may not pierce too violently,
They are delay'd with turns and twinings oft.
For should the voice directly strike the brain,
It would astonish and confuse it much;
Therefore these plaits and folds the sound restrain,
That it the organ may more gently touch. [ Sir John Davies ]

To restrain the tongue is not the least of the virtues.

Check and restrain anger. Never make any determination until you find it has entirely subsided. [ Lord Collingwood ]

Tears are the symbol of the inability of the soul to restrain its emotion and retain its self-command. [ Amiel ]

I think the first virtue is to restrain the tongue; he approaches nearest to the gods who knows how to be silent, even though he is in the right. [ Cato ]

Man is not born to solve the problem of the universe; but to find out what he has to do, and to restrain himself within the limits of his comprehension.

The mathematics are friends to religion, inasmuch as they charm the passions, restrain the impetuosity or imagination, and purge the mind from error and prejudice. [ Arbuthnot ]

In a free and republican government, you cannot restrain the voice of the multitude. Every man will speak as he thinks, or, more properly, without thinking, and consequently will judge of effects without attending to their causes. [ George Washington ]