Keep thy heart with all diligence; for out of it are the issues of life. Proverbs 4:23. RC 163.1
Truly earnest men are few in our world, but they are greatly needed. The example of an energetic person is far-reaching; he has an electric power over others. He meets obstacles in his work; but he has the push in him, and instead of allowing his way to be hedged up, he breaks down every barrier.... RC 163.2
There are thorns in every path. All who follow the Lord's leading must expect to meet with disappointments, crosses, and losses. But a spirit of true heroism will help them to overcome these. Many greatly magnify seeming difficulties, and then begin to pity themselves and give way to despondency. Such need to make an entire change in themselves. They need to discipline themselves to put forth exertion, and to overcome all childish feelings. They should determine that life shall not be spent in working at trifles. Let them resolve to accomplish something, and then do it. RC 163.3
Many make good resolutions, but they are always going to do something and never get to it. About all their resolutions amount to is talk. In many cases, if they had more energy and accomplished something in spite of obstacles, they would have far better health. RC 163.4
Everyone should have an aim, an object, in life. The loins of the mind should be girded up, and the thoughts be trained to keep to the point as the compass to the pole. The mind should be directed in the right channel, according to well-formed plans. Then every step will be a step in advance. No time will be lost in following vague ideas and random plans. Worthy purposes should be kept constantly in view, and every thought and act should tend to their accomplishment. Let there ever be a fixedness of purpose to carry out that which is undertaken. RC 163.5
Success or failure in this life depends much upon the manner in which the thoughts are disciplined. If they are controlled as God directs that they shall be, they will be upon those subjects which will lead to greater devotion. If the thoughts are right, the words will be right.... RC 163.6
The afternoon sun of ... life may be more mellow and productive of fruit than the morning sun. It may continue to increase in size and brightness until it drops behind the western hills.... Keep your heart and mind young by continuous exercise.... RC 163.7
The Bible is the best book in the world for intellectual culture. The grand themes presented in it, the dignified simplicity with which these themes are handled, the light which it sheds upon the mysteries of heaven, bring strength and vigor to the understanding.—The Review and Herald, April 6, 1886. RC 163.8