Antonin Sertillanges quotes:

Very often, gleams of light come in a few minutes' sleeplessness, in a second perhaps; you must fix them. To entrust them to the relaxed brain is like writing on water; there is every chance that on the morrow there will be no slightest trace left of any happening.

The reward of a work is to have produced it; the reward of effort is to have grown by it.

Friendship is an obstetric art; it draws out our richest and deepest resources; it unfolds the wings of our dreams and hidden indeterminate thoughts; it serves as a check on our judgements, tries out our new ideas, keeps up our ardor, and inflames our enthusiasm.

We must beware of yielding to the pressure of a spirit of cowardly conformity which proclaims itself everybody's friend in the hope that everybody will obligingly return the compliment.

It is a painful thing to say to oneself: by choosing one road I am turning my back on a thousand others. Everything is interesting; everything might be useful; everything attracts and charms a noble mind; but death is before us; mind and matter make their demands; willy-nilly we must submit and rest content as to things that time and wisdom deny us, with a glance of sympathy which is another act of our homage to the truth.

Courage is sustained by calling up anew the vision of the goal.