Wisdom of today by Swami Yukteswar.

"Forget the past. The vanished lives of all men are dark with many shames. Human conduct is ever unreliable until anchored in the Divine. Everything in future will improve if you are making a spiritual effort now."
— Sri Yukteswar

Recommended for study :

The Holy Science

By Sri Yukteswar, written at the request of Babaji

“The purpose of this book is to show as clearly as possible that there is an essential unity in all religions; that there is no difference in the truths inculcated by the various faiths; that there is but one method by which the world, both external and internal, has evolved; and that there is but one Goal admitted by all scriptures.” — The Holy Science by Sri Yukteswar

In this book Sri Yukteswar also describes a recurring cycle of human development, called the cycle of the yugas, or ages, which are mentioned in Hindu scriptures.

Source : https://www.sriyukteswar.com/