A heresy can spring only from a system that is in full vigor.
Eric Hoffer

A man must be strong in that profession, he must have vigor of body and mind, yet I am all out of breath if I walk up a hill; I have not the heart to crush even a fly.
Gregorio M. Sierra

Abundance and vigor of automatic movements are desirable, and even a considerable degree of restlessness is a good sign in young children.
G. Stanley Hall

Action is the highest perfection and drawing forth of the utmost power, vigor, and activity of man's nature.
Bishop Robert South

All enterprises that are entered into with indiscreet zeal may be pursued with great vigor at first, but are sure to collapse in the end.
Tacitus

As an example, one of the schools I have been studying is too small to compete effectively in most sports, but participates with vigor each year in the state music contests.
James S. Coleman

Eccentricity has always abounded when and where strength of character had abounded; and the amount of eccentricity in a society has generally been proportional to the amount of genius, mental vigor, and courage which it contained.
John Stuart Mill

Great effort is required to arrest decay and restore vigor. One must exercise proper deliberation, plan carefully before making a move, and be alert in guarding against relapse following a renaissance.
Horace

Human beings can always be relied upon to exert, with vigor, their God-given right to be stupid.
Dean Koontz

If it be true that our people represent a high percentage of mental vigor, the distinction is probably due, in some measure, to the extremely important part which Talmud studies have played in the spiritual life of the race.
Abraham Cahan

If you put all your strength and faith and vigor into a job and try to do the best you can, the money will come.
Lawrence Welk

In composing, as a general rule, run your pen through every other word you have written; you have no idea what vigor it will give your style.
Sydney Smith

In nonviolence you must go full steam ahead, if you want the good to come speedily you must go about it with vigor.
Vinoba Bhave

Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.
Leonardo da Vinci

It has from the beginning been carried on with as much vigor and as great care of our trade as was consistent with our safety at home and with the circumstances we were in at the beginning of the war.
Robert Walpole

Keep up you conjugal love in constant heat and vigor.
Richard Baxter

Knowledge is not a passion from without the mind, but an active exertion of the inward strength, vigor and power of the mind, displaying itself from within.
Ralph Cudworth

Music, which should pulsate with life, needs new means of expression, and science alone can infuse it with youthful vigor.
Edgard Varese

My vigor, vitality and cheek repel me. I am the kind of woman I would run from.
Nancy Astor

Nothing truly convincing - which would possess thoroughness, vigor, and skill - has been written against the ancients as yet; especially not against their poetry.
Karl Wilhelm Friedrich Schlegel